The following patch allows to switch the GUI language to Hungarian (Magyar) via the preferences.
diff --git a/avidemux/common/ADM_commonUI/DIA_prefs.cpp b/avidemux/common/ADM_commonUI/DIA_prefs.cpp
index 7fc4818..5cd6f4c 100644
--- a/avidemux/common/ADM_commonUI/DIA_prefs.cpp
+++ b/avidemux/common/ADM_commonUI/DIA_prefs.cpp
@@ -395,6 +395,7 @@ std::string currentSdlDriver=getSdlDriverName();
{"es","Español"},
{"fr","Français"},
{"it","Italiano"},
+ {"hu","Magyar"},
{"pl","Polski"},
{"ru","àÃ'Æ'Ã'ÂÃ'Âúøù"},
};