Sry for the delay. Now here is what I did and the results:
1.
*start VLC with vlc --language de ==> GUI opens all english
*open Settings->Preferences...->Interface ==> Language Pulldown menu is set to "German";
*I set it to German one more time;
*press "Save" ==> Preferences dialog closes, GUI still all english
*close VLC
*delete cache (by deleting folder %APPDATA%\vlc\cache)
*start vlc by just typing vlc in command prompt ==> GUI opens all english
2.
*same as 1. but always start vlc with vlc --language de
3.
*delete cache (by deleting folder %APPDATA%\vlc\cache)
*start VLC with vlc --language de ==> GUI opens all english
*open Settings->Preferences...->Interface ==> Language Pulldown menu is set to "German";
*I set it to German one more time;
*press "Save" ==> Preferences dialog closes, GUI still all english
*close VLC
*delete cache (by deleting folder %APPDATA%\vlc\cache)
*start vlc by just typing vlc in command prompt ==> GUI opens all english
... some more alike variations, all resulting in GUI beeing still english ...
vlc --reser-plugins-cache --language de or vlc --language de --reset-plugins-cache also made no difference.
Other suggestions?
PS: I quickly read the thread Siggimund linked, so just to make sure: I mean VLCs GUI language, not some DVD-stuff since I don't use VLC to play DVDs at all.
![Wink ;)](./images/smilies/icon_wink.gif)
Is it even possible to change VLCs GUI language after all?
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)