Override Backend Language

I would like to change some of the German Language Translations which is here

modules/backend/lang/de/lang.php

How can i override this file from a plugin or somewhere else but not in the default location.

I tried.

  1. make a directory ROOT / lang / de => didnt worked
  2. make a directory ROOT/ plugins / company /customPlugin / lang / de => didnt worked

Thanks alot

Try ROOT / app / lang / …

@daft thanks

tried already as

Root / app / lang / de / lang.php

But not working

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