[Fixed] Notepad ++ 7.5.6 does not save the language setting

I can confirm that behavior. A quick check of the app's configuration revealed, that automatic language handling with the Notepad++PortableSettings.ini and the custom.ini just works in conjuction with the PA.c menu. The language variable is read by the launcher to set the language according to the menu language, but it does not write the language string after the language is changed in a standalone session without the menu. That way, it always uses the setting of the menu, or the default (english) when used without the menu. I think a Post section in the custom.nsh could fix that behavior.

@Ulf2014:
A quick fix for you would be to run it once from the menu set to german, or - if you don't use the menu - edit the Notepad++PortableSettings.ini located in \Notepad++Portable\Data\settings. Just change Language entry to GERMAN.

Please add a [BUG] to the title of your topic so it can be picked up by the bug tracker.

In German:
Hallo Ulf2014, als Notlösung kannst Du einmal das PA.c Menü starten, auf Deutsch umstellen und dann Notepad++ daraus aufrufen. Falls Du das Menü nicht nutzt, kannst Du die Notepad++PortableSettings.ini im Ordner \Notepad++Portable\Data\settings editieren. Einfach den Language Eintrag in GERMAN ändern. Das ist aber nur ein temporärer Fix.
Stell bitte dem Titel deines Postings noch ein [BUG] voran, damit der Bug-Tracker das aufnimmt.

This is a holdover in the launcher from before Notepad++ had an option to change languages in the interface. I'll remove it in the next release.

This is fixed in today's release.