ph7cms, in version 16.0.0 the language files are without function!

[mOOm001]

Hello

am i a single case or are the language files from the 15.4.0 no longer compatible with the 16.0.0 and thus without function, i uploaded them according to the instructions here, also get the flag selection of the appropriate national language, but no matter how the selection is set, the language does not change, it remains English!

Where is the error, is there an update of the language files for this case?