diff --git a/po/cs.po b/po/cs.po
index 2162e538..6e4e50ae 100644
--- a/po/cs.po
+++ b/po/cs.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC a přispěvatelé"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "program pro sledování satelitů a předpověď drah v reálném čase"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -151,6 +160,11 @@ msgstr "%s: Chyba při čtení %s (%s)"
 msgid "Gpredict Info"
 msgstr "Informace Gpredict"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Informace Gpredict: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2507,7 +2521,7 @@ msgstr "_Nastavení"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "Online nápo_věda"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2517,6 +2531,10 @@ msgstr "_Licence"
 msgid "_News"
 msgstr "_Novinky"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Autoři"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_O Gpredict"
diff --git a/po/da.po b/po/da.po
index 657c5b48..ba87b0eb 100644
--- a/po/da.po
+++ b/po/da.po
@@ -24,6 +24,15 @@ msgstr "Gpredict"
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC og bidragydere"
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC og bidragydere"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "program til satellitsporing og baneberegning i realtid"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -143,6 +152,11 @@ msgstr "%s: Fejl under læsning af %s (%s)"
 msgid "Gpredict Info"
 msgstr "Gpredict Info"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Gpredict Info: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2477,7 +2491,7 @@ msgstr "_Indstillinger"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr "_Online-hjælp"
+msgstr "Online-_hjælp"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2487,6 +2501,10 @@ msgstr "_Licens"
 msgid "_News"
 msgstr "_Nyheder"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Bidragydere"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_Om Gpredict"
diff --git a/po/de.po b/po/de.po
index 24b061ce..d168f543 100644
--- a/po/de.po
+++ b/po/de.po
@@ -28,6 +28,15 @@ msgstr "Gpredict"
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr "Copyright (C) 2001-2017 Alexandru Csete OZ9AEC und Mitwirkende."
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC und Mitwirkende"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "Echtzeit-Satellitenverfolgungs- und Umlaufbahnberechnungsprogramm"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -159,6 +168,11 @@ msgstr "%s: Fehler beim Lesen von %s (%s)"
 msgid "Gpredict Info"
 msgstr "Gpredict Info"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Gpredict-Info: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -1662,11 +1676,11 @@ msgstr "%s:%d: %s wurde aufgerufen mit NULL Parameter!"
 
 #: ../src/gtk-sat-module-popup.c:1110
 msgid "Detach module"
-msgstr "Modul trennen"
+msgstr "Modul entkoppeln"
 
 #: ../src/gtk-sat-module-popup.c:1117
 msgid "Attach module"
-msgstr "Modul hinzufügen"
+msgstr "Modul koppeln"
 
 #: ../src/gtk-sat-module-popup.c:1125
 msgid "Exit full screen"
@@ -1674,7 +1688,7 @@ msgstr "Vollbildmodus beenden"
 
 #: ../src/gtk-sat-module-popup.c:1132
 msgid "Full screen"
-msgstr "Vollbild"
+msgstr "Vollbildmodus"
 
 #. autotrack
 #: ../src/gtk-sat-module-popup.c:1143
@@ -1731,7 +1745,7 @@ msgstr "Schließen"
 #: ../src/gtk-sat-module-tmg.c:62
 #, c-format
 msgid "%s: Time Controller for %s is already active"
-msgstr "%s: Zeitsimulation für %s ist bereits aktiv."
+msgstr "%s: Zeitsimulation für %s ist bereits aktiv"
 
 #: ../src/gtk-sat-module-tmg.c:90
 msgid "Play forward"
@@ -1759,7 +1773,7 @@ msgstr "Zurücksetzen"
 
 #: ../src/gtk-sat-module-tmg.c:129
 msgid "Reset to current date and time"
-msgstr "Setze das aktuelle Datum und die aktuelle Zeit zurück."
+msgstr "Setze auf das aktuelle Datum und die aktuelle Zeit zurück"
 
 #: ../src/gtk-sat-module-tmg.c:136 ../src/gtk-sat-module-tmg.c:735
 msgid "<b>Real-Time</b>"
@@ -1786,7 +1800,7 @@ msgstr "Min.:"
 
 #: ../src/gtk-sat-module-tmg.c:186
 msgid "Use this control to set the minutes"
-msgstr "Benutzen Sie dieses Feld um die Minuten zu setzen."
+msgstr "Benutzen Sie dieses Feld um die Minuten zu setzen"
 
 #. seconds
 #: ../src/gtk-sat-module-tmg.c:193
@@ -1795,7 +1809,7 @@ msgstr "Sek.:"
 
 #: ../src/gtk-sat-module-tmg.c:203
 msgid "Use this control to set the seconds"
-msgstr "Benutzen Sie dieses Feld um die Sekunden zu setzen."
+msgstr "Benutzen Sie dieses Feld um die Sekunden zu setzen"
 
 #. milliseconds
 #: ../src/gtk-sat-module-tmg.c:210
@@ -1804,7 +1818,7 @@ msgstr "mSek.:"
 
 #: ../src/gtk-sat-module-tmg.c:220
 msgid "Use this control to set the milliseconds"
-msgstr "Benutzen Sie dieses Feld um die Millisekunden zu setzen."
+msgstr "Benutzen Sie dieses Feld um die Millisekunden zu setzen"
 
 #. time throttle
 #: ../src/gtk-sat-module-tmg.c:227
@@ -1939,12 +1953,12 @@ msgstr "%s:%s: Das Öffnen des Satellitenverzeichnisses schlug fehl %s."
 #: ../src/gtk-sat-selector.c:787
 #, c-format
 msgid "%s:%s: Read %d satellites into MAIN group."
-msgstr "%s:%s: %d Satelliten der MAIN Gruppe werden gelesen"
+msgstr "%s:%s: %d Satelliten der MAIN Gruppe werden gelesen."
 
 #: ../src/gtk-sat-selector.c:904
 #, c-format
 msgid "%s: Error getting %dth satellite"
-msgstr "%s: Fehler beim Holen vom %dten Satellit."
+msgstr "%s: Fehler beim Holen vom %dten Satellit"
 
 #: ../src/gtk-sat-tree.c:199 ../src/mod-cfg.c:531
 msgid "Epoch"
@@ -1961,7 +1975,7 @@ msgstr "Erweitern"
 
 #: ../src/gtk-sat-tree.c:244
 msgid "Expand all nodes in the tree to make it searchable"
-msgstr "Erweitern SIe alle Knoten im Baum um ihn durchsuchbar zu machen"
+msgstr "Erweitern Sie alle Knoten im Baum um ihn durchsuchbar zu machen"
 
 #: ../src/gtk-sat-tree.c:247
 msgid "Collapse"
@@ -2472,9 +2486,9 @@ msgid ""
 "Satellites skipped:\t 0\n"
 "Missing Satellites:\t 0\n"
 msgstr ""
-"Aktualisierte Satelliten:\t         0\n"
-"Übersprungene Satelliten:       \t 0\n"
-"Fehlende Satelliten:        \t         0\n"
+"Aktualisierte Satelliten:\t 0\n"
+"Übersprungene Satelliten:\t 0\n"
+"Fehlende Satelliten:\t 0\n"
 
 #. create file chooser
 #: ../src/menubar.c:668
@@ -2527,19 +2541,16 @@ msgid "_Quit"
 msgstr "_Beenden"
 
 #: ../src/menubar.c:891
-#, fuzzy
 msgid "Update TLE data from _network"
 msgstr "TLE-Aktualisierung aus _Netz"
 
 #: ../src/menubar.c:896
-#, fuzzy
 msgid "Update TLE data from local _files"
-msgstr "TLE-Aktualisierung aus _Datei"
+msgstr "TLE-Aktualisierung aus lokalen _Dateien"
 
 #: ../src/menubar.c:901
-#, fuzzy
 msgid "Update transponder data"
-msgstr "_Transponder-Daten aktualisieren"
+msgstr "Transponder-Daten aktualisieren"
 
 #: ../src/menubar.c:909
 msgid "_Preferences"
@@ -2557,6 +2568,10 @@ msgstr "_Lizenz"
 msgid "_News"
 msgstr "_Neuigkeiten"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Mitwirkende"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_Über Gpredict"
@@ -2728,7 +2743,7 @@ msgstr "%s: %s wiederherstellen fehlgeschlagen"
 #: ../src/mod-mgr.c:167
 #, c-format
 msgid "%s: No modules have to be restored."
-msgstr "%s: Keine Module müssen wiederhergestellt werden"
+msgstr "%s: Keine Module müssen wiederhergestellt werden."
 
 #: ../src/mod-mgr.c:205
 #, c-format
diff --git a/po/el.po b/po/el.po
index 96ca668f..4016c58e 100644
--- a/po/el.po
+++ b/po/el.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC και συνεισφέροντες"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "πρόγραμμα παρακολούθησης δορυφόρων και πρόβλεψης τροχιών σε πραγματικό χρόνο"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -147,6 +156,11 @@ msgstr ""
 msgid "Gpredict Info"
 msgstr "Gpredict Πληροφορίες"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Gpredict Πληροφορίες: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2452,7 +2466,7 @@ msgstr "_Ρυθμίσεις"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "_Online βοήθεια"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2462,6 +2476,10 @@ msgstr "_Άδεια χρήσης"
 msgid "_News"
 msgstr "_Νέα"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Συγγραφείς"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_Περί του Gpredict"
diff --git a/po/en_GB.po b/po/en_GB.po
index 56151285..c6bd4684 100644
--- a/po/en_GB.po
+++ b/po/en_GB.po
@@ -27,6 +27,15 @@ msgstr "Gpredict"
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "real time satellite tracking and orbit prediction program"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -154,6 +163,11 @@ msgstr "%s: Error reading %s (%s)"
 msgid "Gpredict Info"
 msgstr "Gpredict Info"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Gpredict Info: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2522,6 +2536,10 @@ msgstr "_Licence"
 msgid "_News"
 msgstr "_News"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "A_uthors"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_About Gpredict"
diff --git a/po/es.po b/po/es.po
index ebf46c15..744d55eb 100644
--- a/po/es.po
+++ b/po/es.po
@@ -29,6 +29,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC y colaboradores"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "programa de seguimiento de satélites y predicción de órbitas en tiempo real"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -157,6 +166,11 @@ msgstr "%s: Error de lectura %s (%s)"
 msgid "Gpredict Info"
 msgstr "Información de Gpredict"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Información de Gpredict: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2530,7 +2544,7 @@ msgstr "_Preferencias"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "A_yuda en línea"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2540,6 +2554,10 @@ msgstr "_Licencia"
 msgid "_News"
 msgstr "_Noticias"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "Au_tores"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_Acerca de Gpredict"
@@ -2554,7 +2572,7 @@ msgstr "_Editar"
 
 #: ../src/menubar.c:975
 msgid "_Help"
-msgstr "Ayuda"
+msgstr "A_yuda"
 
 #: ../src/mod-cfg.c:62
 #, c-format
diff --git a/po/fi.po b/po/fi.po
index 5fc06dda..d72b4114 100644
--- a/po/fi.po
+++ b/po/fi.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC ja avustajat"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "reaaliaikainen satelliittien seuranta- ja ratalaskentaohjelma"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -148,6 +157,11 @@ msgstr "%s: Virhe luettaessa %s (%s)"
 msgid "Gpredict Info"
 msgstr "Gpredict Info"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Gpredict Info: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2452,19 +2466,23 @@ msgstr ""
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "_Verkko-ohje"
 
 #: ../src/menubar.c:931
 msgid "_License"
-msgstr ""
+msgstr "_Lisenssi"
 
 #: ../src/menubar.c:936
 msgid "_News"
-msgstr ""
+msgstr "_Uutiset"
+
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Kehittäjät"
 
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
-msgstr ""
+msgstr "_Tietoja Gpredictistä"
 
 #: ../src/menubar.c:963
 msgid "_File"
@@ -2476,7 +2494,7 @@ msgstr ""
 
 #: ../src/menubar.c:975
 msgid "_Help"
-msgstr ""
+msgstr "_Ohje"
 
 #: ../src/mod-cfg.c:62
 #, c-format
diff --git a/po/fr.po b/po/fr.po
index 75546974..b74f7a93 100644
--- a/po/fr.po
+++ b/po/fr.po
@@ -26,6 +26,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC et contributeurs"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "programme de suivi de satellites et de prédiction d'orbites en temps réel"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -156,6 +165,11 @@ msgstr "%s : erreur lors de la lecture de %s (%s)"
 msgid "Gpredict Info"
 msgstr "Infos Gpredict"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Infos Gpredict: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2478,6 +2492,10 @@ msgstr "_Licence"
 msgid "_News"
 msgstr "_Nouvelles"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "A_uteurs"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "À _propos de Gpredict"
diff --git a/po/id.po b/po/id.po
index 44dbf58b..f890333a 100644
--- a/po/id.po
+++ b/po/id.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC dan kontributor"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "program pelacakan satelit dan prediksi orbit waktu nyata"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -146,6 +155,11 @@ msgstr "%s: Galat membaca %s (%s)"
 msgid "Gpredict Info"
 msgstr "Info Gpredict"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Info Gpredict: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2430,19 +2444,23 @@ msgstr ""
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "Bantuan _daring"
 
 #: ../src/menubar.c:931
 msgid "_License"
-msgstr ""
+msgstr "_Lisensi"
 
 #: ../src/menubar.c:936
 msgid "_News"
-msgstr ""
+msgstr "_Berita"
+
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Penulis"
 
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
-msgstr ""
+msgstr "_Tentang Gpredict"
 
 #: ../src/menubar.c:963
 msgid "_File"
@@ -2454,7 +2472,7 @@ msgstr ""
 
 #: ../src/menubar.c:975
 msgid "_Help"
-msgstr ""
+msgstr "_Bantuan"
 
 #: ../src/mod-cfg.c:62
 #, c-format
diff --git a/po/it.po b/po/it.po
index 2da2fb87..51718ba5 100644
--- a/po/it.po
+++ b/po/it.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC e collaboratori"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "programma di tracciamento satellitare e previsione orbitale in tempo reale"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -151,6 +160,11 @@ msgstr "%s: Errore nella lettura %s (%s)"
 msgid "Gpredict Info"
 msgstr "Informazioni"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Informazioni: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2450,7 +2464,7 @@ msgstr "Preferen_ze"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "_Guida in linea"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2458,7 +2472,11 @@ msgstr "_Licenza"
 
 #: ../src/menubar.c:936
 msgid "_News"
-msgstr ""
+msgstr "_Novità"
+
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Autori"
 
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
diff --git a/po/lt.po b/po/lt.po
index ad1853c3..b8ac97fb 100644
--- a/po/lt.po
+++ b/po/lt.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC ir bendradarbiai"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "palydovų sekimo realiuoju laiku ir orbitų prognozavimo programa"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -147,6 +156,11 @@ msgstr "%s: Klaida skaitant %s (%s)"
 msgid "Gpredict Info"
 msgstr "Gpredict Info"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Gpredict Info: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2477,7 +2491,7 @@ msgstr "_Nustatymai"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "_Žinynas internete"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2487,6 +2501,10 @@ msgstr "_Licencija"
 msgid "_News"
 msgstr "_Naujienos"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "Au_toriai"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_Apie Gpredict"
diff --git a/po/ru.po b/po/ru.po
index b79e7de4..fd1892d3 100644
--- a/po/ru.po
+++ b/po/ru.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC и участники"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "программа слежения за спутниками и прогнозирования орбит в реальном времени"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -150,6 +159,11 @@ msgstr "%s: Ошибка чтения %s (%s)"
 msgid "Gpredict Info"
 msgstr "Сведения Gpredict"
 
+#: ../src/gpredict-help.c:137
+#, c-format
+msgid "Gpredict Info: %s"
+msgstr "Сведения Gpredict: %s"
+
 #: ../src/gpredict-utils.c:241 ../src/gpredict-utils.c:280
 #: ../src/gpredict-utils.c:328 ../src/gpredict-utils.c:370
 #, c-format
@@ -2479,7 +2493,7 @@ msgstr "_Параметры"
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "_Справка в интернете"
 
 #: ../src/menubar.c:931
 msgid "_License"
@@ -2489,6 +2503,10 @@ msgstr "_Лицензия"
 msgid "_News"
 msgstr "_Новости"
 
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Авторы"
+
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
 msgstr "_О Gpredict"
diff --git a/po/th.po b/po/th.po
index 8acffa14..d6ddcd69 100644
--- a/po/th.po
+++ b/po/th.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC และผู้ร่วมพัฒนา"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "โปรแกรมติดตามดาวเทียมและพยากรณ์วงโคจรแบบเวลาจริง"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -2427,19 +2436,23 @@ msgstr ""
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "วิธีใช้ออนไลน์ (_O)"
 
 #: ../src/menubar.c:931
 msgid "_License"
-msgstr ""
+msgstr "สัญญาอนุญาต (_L)"
 
 #: ../src/menubar.c:936
 msgid "_News"
-msgstr ""
+msgstr "ข่าว (_N)"
+
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "ผู้พัฒนา (_U)"
 
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
-msgstr ""
+msgstr "เกี่ยวกับ Gpredict (_A)"
 
 #: ../src/menubar.c:963
 msgid "_File"
@@ -2451,7 +2464,7 @@ msgstr ""
 
 #: ../src/menubar.c:975
 msgid "_Help"
-msgstr ""
+msgstr "วิธีใช้ (_H)"
 
 #: ../src/mod-cfg.c:62
 #, c-format
diff --git a/po/uk.po b/po/uk.po
index 32da59a5..6c31ad92 100644
--- a/po/uk.po
+++ b/po/uk.po
@@ -27,6 +27,15 @@ msgstr ""
 msgid "Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"
 msgstr ""
 
+#: ../src/about.c:123
+#, c-format
+msgid "Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"
+msgstr "Copyright (C) 2001-%s Alexandru Csete OZ9AEC та учасники"
+
+#: ../src/about.c:120
+msgid "real time satellite tracking and orbit prediction program"
+msgstr "програма відстеження супутників і прогнозування орбіт у реальному часі"
+
 #: ../src/about.c:136
 msgid "translator-credits"
 msgstr ""
@@ -2425,19 +2434,23 @@ msgstr ""
 
 #: ../src/menubar.c:922
 msgid "_Online help"
-msgstr ""
+msgstr "_Довідка онлайн"
 
 #: ../src/menubar.c:931
 msgid "_License"
-msgstr ""
+msgstr "_Ліцензія"
 
 #: ../src/menubar.c:936
 msgid "_News"
-msgstr ""
+msgstr "_Новини"
+
+#: ../src/menubar.c:948
+msgid "A_uthors"
+msgstr "_Автори"
 
 #: ../src/menubar.c:943
 msgid "_About Gpredict"
-msgstr ""
+msgstr "_Про Gpredict"
 
 #: ../src/menubar.c:963
 msgid "_File"
@@ -2449,7 +2462,7 @@ msgstr ""
 
 #: ../src/menubar.c:975
 msgid "_Help"
-msgstr ""
+msgstr "_Довідка"
 
 #: ../src/mod-cfg.c:62
 #, c-format
diff --git a/src/about.c b/src/about.c
index 51e83592..f288741f 100644
--- a/src/about.c
+++ b/src/about.c
@@ -30,113 +30,126 @@
 
 #include "about.h"
 #include "compat.h"
+#include "gpredict-help.h"
+#include "sat-log.h"
 
-/* clang-format off */
-const gchar *authors[] = {
-    "Alexandru Csete, OZ9AEC, with contributions from:",
-    "",
-    "A. Maitland Bottoms, AA4HS",
-    "A. Walker",
-    "Alan Moffet, KE7IJZ",
-    "Andi Chandler, G7SCI",
-    "AsciiWolf",
-    "Baris Dinc, TA7W",
-    "Bastian Germann",
-    "Bob Mattaliano, N6RFM",
-    "Charles Suprin, AA1VS",
-    "Chloë DeCicco",
-    "Dale Mellor",
-    "Daniel Estevez, EA4GPZ",
-    "DarkStar",
-    "Dave Hines",
-    "David Cureton",
-    "David Frisbee, K4DBF",
-    "David VK5DG",
-    "Fabian P. Schmidt",
-    "Gisle Vanem",
-    "Henry Hallam",
-    "Honorius Neogy",
-    "Ilias Daradimos",
-    "Jan Simon, DL2ZXA",
-    "Jason Uher",
-    "Joachim Euchner",
-    "John Magliacane, KD2BD",
-    "Jonathan Holmgren",
-    "KaComet",
-    "Libre Space Foundation",
-    "Liu Xinyu",
-    "Lloyd Brown",
-    "LongnoseRob, JI1MNC",
-    "Marcel Cimander",
-    "Mario Haustein",
-    "Martin Pool",
-    "Matthew Alberti, KM4EXS",
-    "Matthew Hassell",
-    "Michael Black",
-    "Michael Tatarinov",
-    "Milad Fa",
-    "Mirko Caserta",
-    "Nate Bargmann, N0NB",
-    "Neoklis Kyriazis, 5B4AZ",
-    "Nerijus Bendžiūnas",
-    "Nicholas DeCicco",
-    "Patrick Dohmen, DL4PD",
-    "Patrick Strasser, OE6PSE",
-    "Paul Schulz, VK5FPAW",
-    "Phil Ashby, 2E0IPX",
-    "Philipp Lopaur",
-    "S. R. Sampson",
-    "Satoshi Yasuda, 7M3TJZ",
-    "Sayafdine Said",
-    "Sean Svihla",
-    "Stefan Lobas",
-    "Stephane Fillod",
-    "Tim Brooks",
-    "Tobias Nießen",
-    "Tom Jones",
-    "T.S. Kelso",
-    "Valentin Yakovenkov",
-    "Wahaj18",
-    "William J Beksi, KC2EXL",
-    "Xavier Crehueras, EB3CZS",
-    "Yaroslav Stavnichiy",
-    "Yasushi SHOJI",
-    "",
-    "Imagery:",
-    "Most of the maps originate from NASA Visible Earth",
-    "see website http://visibleearth.nasa.gov/",
+/* Credits shown if the AUTHORS file can not be read */
+static const gchar *fallback_authors[] = {
+    "Alexandru Csete, OZ9AEC, and contributors",
     NULL
 };
-/* clang-format on */
+
+/* Last year of the copyright period shown in the about dialog */
+#define COPYRIGHT_YEAR "2026"
 
 extern GtkWidget *app;
 
+/**
+ * Read the list of authors from the AUTHORS file.
+ *
+ * Each line of the file becomes one line in the credits, with the "- "
+ * list markers removed. Leading and trailing empty lines are dropped.
+ *
+ * @return NULL-terminated string array to be freed with g_strfreev(), or
+ *         NULL if the file could not be read.
+ */
+static gchar **read_authors(void)
+{
+    GError *error = NULL;
+    GPtrArray *lines;
+    gchar **raw;
+    gchar *fname;
+    gchar *contents;
+    gchar *line;
+    guint i;
+
+    fname = gpredict_help_txt_file_name("AUTHORS");
+    if (!g_file_get_contents(fname, &contents, NULL, &error))
+    {
+        sat_log_log(SAT_LOG_LEVEL_ERROR, _("%s: Failed to load %s (%s)"),
+                    __func__, fname, error->message);
+        g_clear_error(&error);
+        g_free(fname);
+        return NULL;
+    }
+    g_free(fname);
+
+    raw = g_strsplit(contents, "\n", -1);
+    g_free(contents);
+
+    lines = g_ptr_array_new_with_free_func(g_free);
+    for (i = 0; raw[i] != NULL; i++)
+    {
+        line = g_strstrip(raw[i]);
+        if (g_str_has_prefix(line, "- "))
+            line += 2;
+
+        /* skip leading empty lines */
+        if (lines->len == 0 && line[0] == '\0')
+            continue;
+
+        g_ptr_array_add(lines, g_strdup(line));
+    }
+    g_strfreev(raw);
+
+    /* drop trailing empty lines */
+    while (lines->len > 0 &&
+           ((gchar *) g_ptr_array_index(lines, lines->len - 1))[0] == '\0')
+        g_ptr_array_remove_index(lines, lines->len - 1);
+
+    g_ptr_array_add(lines, NULL);
+
+    return (gchar **) g_ptr_array_free(lines, FALSE);
+}
+
 void about_dialog_create()
 {
     GtkWidget *dialog;
-    GdkPixbuf *icon;
+    GdkPixbuf *logo;
     gchar *iconfile;
+    gchar *logofile;
+    gchar *copyright;
+    gchar **authors;
 
     dialog = gtk_about_dialog_new();
+
     gtk_window_set_transient_for(GTK_WINDOW(dialog), GTK_WINDOW(app));
     gtk_about_dialog_set_program_name(GTK_ABOUT_DIALOG(dialog), _("Gpredict"));
-    gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(dialog), VERSION);
-    gtk_about_dialog_set_copyright(
+    gtk_about_dialog_set_comments(
         GTK_ABOUT_DIALOG(dialog),
-        _("Copyright (C) 2001-2019 Alexandru Csete OZ9AEC and contributors"));
+        _("real time satellite tracking and orbit prediction program"));
+    gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(dialog), VERSION);
+    copyright = g_strdup_printf(
+        _("Copyright (C) 2001-%s Alexandru Csete OZ9AEC and contributors"),
+        COPYRIGHT_YEAR);
+    gtk_about_dialog_set_copyright(GTK_ABOUT_DIALOG(dialog), copyright);
+    g_free(copyright);
     gtk_about_dialog_set_website(GTK_ABOUT_DIALOG(dialog),
-                                 "http://gpredict.oz9aec.net/");
+                                 "https://oz9aec.dk/gpredict");
     gtk_about_dialog_set_license_type(GTK_ABOUT_DIALOG(dialog),
                                       GTK_LICENSE_GPL_2_0);
-    iconfile = logo_file_name("gpredict_icon_color.svg");
-    icon = gdk_pixbuf_new_from_file_at_size(iconfile, 128, 128, NULL);
-    gtk_about_dialog_set_logo(GTK_ABOUT_DIALOG(dialog), icon);
+
+    logofile = logo_file_name("gpredict_icon_color.svg");
+    logo = gdk_pixbuf_new_from_file_at_size(logofile, 128, 128, NULL);
+    g_free(logofile);
+    if (logo)
+    {
+        gtk_about_dialog_set_logo(GTK_ABOUT_DIALOG(dialog), logo);
+        g_object_unref(logo);
+    }
+
+    iconfile = icon_file_name("gpredict-icon.png");
     gtk_window_set_icon_from_file(GTK_WINDOW(dialog), iconfile, NULL);
     g_free(iconfile);
-    g_object_unref(icon);
-    gtk_about_dialog_set_authors(GTK_ABOUT_DIALOG(dialog), authors);
+
+    authors = read_authors();
+    gtk_about_dialog_set_authors(GTK_ABOUT_DIALOG(dialog),
+                                 authors ? (const gchar **) authors :
+                                 fallback_authors);
+    g_strfreev(authors);
     gtk_about_dialog_set_translator_credits(GTK_ABOUT_DIALOG(dialog),
                                             _("translator-credits"));
+
     gtk_dialog_run(GTK_DIALOG(dialog));
     gtk_widget_destroy(dialog);
 }
diff --git a/src/gpredict-help.c b/src/gpredict-help.c
index cf0af5c7..4273902e 100644
--- a/src/gpredict-help.c
+++ b/src/gpredict-help.c
@@ -34,13 +34,38 @@
 
 extern GtkWidget *app;
 
+/**
+ * Get the full path of a text file in the gpredict system directory
+ * @param filename The basic file name
+ * @return Newly allocated path that must be freed with g_free()
+ *
+ * This function is intended for files like NEWS, COPYING, etc.
+ * On Windows these files are in the doc directory of the installation.
+ */
+gchar *gpredict_help_txt_file_name(const gchar *filename)
+{
+    gchar *fname;
+
+#ifdef G_OS_UNIX
+    fname = g_strconcat(PACKAGE_DATA_DIR, G_DIR_SEPARATOR_S, filename, NULL);
+#endif
+#ifdef G_OS_WIN32
+    gchar *instdir;
+
+    instdir = g_win32_get_package_installation_directory_of_module(NULL);
+    fname = g_strconcat(instdir, G_DIR_SEPARATOR_S, "doc", G_DIR_SEPARATOR_S,
+                        filename, NULL);
+    g_free(instdir);
+#endif
+
+    return fname;
+}
+
 /**
  * Show a text file in the gpredict system directory
  * @param filename The basic file name
  *
  * This function is intended to display files like NEWS, COPYING, etc.
- * Note that on windows these files have .txt suffix, while on Unix they
- * do not.
  */
 void gpredict_help_show_txt(const gchar *filename)
 {
@@ -52,18 +77,10 @@ void gpredict_help_show_txt(const gchar *filename)
     GError *error = NULL;
     gchar *fname;
     gchar *buff;
+    gchar *title;
     gsize length;
 
-    /* get system data directory */
-#ifdef G_OS_UNIX
-    fname = g_strconcat(PACKAGE_DATA_DIR, G_DIR_SEPARATOR_S, filename, NULL);
-#endif
-#ifdef G_OS_WIN32
-    buff = g_win32_get_package_installation_directory_of_module(NULL);
-    fname = g_strconcat(buff, G_DIR_SEPARATOR_S, "doc", G_DIR_SEPARATOR_S,
-                        filename, ".txt", NULL);
-    g_free(buff);
-#endif
+    fname = gpredict_help_txt_file_name(filename);
 
     /* load file into buffer */
     chan = g_io_channel_new_file(fname, "r", &error);
@@ -116,8 +133,10 @@ void gpredict_help_show_txt(const gchar *filename)
     gtk_container_add(GTK_CONTAINER(swin), view);
 
     /* create and show dialogue with textbuffer */
-    dialog = gtk_dialog_new_with_buttons(_("Gpredict Info"), GTK_WINDOW(app), 0,
+    title = g_strdup_printf(_("Gpredict Info: %s"), filename);
+    dialog = gtk_dialog_new_with_buttons(title, GTK_WINDOW(app), 0,
                                          "_Close", GTK_RESPONSE_ACCEPT, NULL);
+    g_free(title);
     gtk_widget_set_size_request(dialog, -1, 450);
     buff = icon_file_name("gpredict-icon.png");
     gtk_window_set_icon_from_file(GTK_WINDOW(dialog), buff, NULL);
diff --git a/src/gpredict-help.h b/src/gpredict-help.h
index 561f3f26..7eb45db1 100644
--- a/src/gpredict-help.h
+++ b/src/gpredict-help.h
@@ -1,6 +1,7 @@
 #ifndef GPREDICT_HELP_H
 #define GPREDICT_HELP_H 1
 
+gchar *gpredict_help_txt_file_name(const gchar *filename);
 void gpredict_help_show_txt(const gchar *filename);
 
 #endif
diff --git a/src/menubar.c b/src/menubar.c
index d99cf860..c0dc83cf 100644
--- a/src/menubar.c
+++ b/src/menubar.c
@@ -814,7 +814,7 @@ static void menubar_help_cb(GtkWidget * widget, gpointer data)
                                       "video tutorials are available from the \n"
                                       "Gpredict website:"));
 
-    button = gtk_link_button_new("http://gpredict.oz9aec.net/documents.php");
+    button = gtk_link_button_new("https://oz9aec.dk/gpredict/documents.php");
     gtk_widget_show(button);
 
     gtk_box_pack_start(GTK_BOX
@@ -841,6 +841,14 @@ static void menubar_news_cb(GtkWidget * widget, gpointer data)
     gpredict_help_show_txt("NEWS");
 }
 
+static void menubar_authors_cb(GtkWidget * widget, gpointer data)
+{
+    (void)widget;
+    (void)data;
+
+    gpredict_help_show_txt("AUTHORS");
+}
+
 static void menubar_about_cb(GtkWidget * widget, gpointer data)
 {
     (void)widget;
@@ -950,6 +958,10 @@ static void create_help_menu_items(GtkMenuShell * menu,
     g_signal_connect(menu_item, "activate", G_CALLBACK(menubar_news_cb), NULL);
     gtk_menu_shell_append(menu, menu_item);
 
+    menu_item = gtk_menu_item_new_with_mnemonic(_("A_uthors"));
+    g_signal_connect(menu_item, "activate", G_CALLBACK(menubar_authors_cb), NULL);
+    gtk_menu_shell_append(menu, menu_item);
+
     menu_item = gtk_separator_menu_item_new();
     gtk_menu_shell_append(menu, menu_item);