Problem with language selection German Nik Collection 4.1 + 4.2


After installing the Nik Collection 4 software, I noticed that parts of the software did not start in German, but in English, even though German was selected during installation.
Unfortunately, this problem has not been resolved in version 4.2, although I reported it to support.

When using a Windows 10 (64-bit) user account without admin rights, I have the problem that the products Sharpener Pro (RAW Presharpener and Output Sharpener), Dfine and Perspective Efex always start in English, while the other products are displayed correctly in German.
It doesn’t matter whether I start the programs alone or as Photoshop or Lightroom plugins, the error is always the same.
With “Perspective Efex”, the language cannot be changed manually from English to German via the Settings option, as this change cannot be saved and therefore starts again in English when the program is restarted.

However, if I right-click on the programs and select “Run as administrator”, they start correctly in German.
Even started directly in the administrator account, everything works as it should.

However, for security reasons I do not want to use the software with administrator rights.
Multiple attempts to uninstall and reinstall and also to create a new Win 10 user account did not solve this problem.
Can you give me a solution to solve this problem?