Rawtherapee 5.3-524 and gimp 2.9.9 on Ubuntu Studio 17.10

Hello, …
I’m using Rawtherapee 5.3-524 on Ubuntu Studio 17.10.
I have compiled it myself and use it in German.
When I transfer the picture out of Rawtherapee to gimp, gimp starts in English.
How can I change this.
I want to start the gimp, as usual, in German

Thanks in advance

Does GIMP start in german if not started from RawTherapee?

220/5000
Yes GIMP starts in German, if not started by RawTherapee?
But unfortunately not from Rawtherpee …
Console Output:
(file-tiff: 18925): Gtk Warning **: Locale not supported by C library.
Using the fallback ‘C’ locale.

Under Preferences > General, there is an option to set your External Editor. Use the Other command line to launch gimp and set your language. Something like this:

export LANGUAGE=de_DE:$LANGUAGE & gimp

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I’ve already tried that.
When I use this, I get the following error message:
"The external editor can not be started.
Put the right path in the settings. "
(This is translated with the google translator)

What’s that part for?

I don’t think that’s necessary. This should do it:

LANG=de gimp

Though I can’t test it out because I have no other languages installed.

https://docs.gimp.org/en/gimp-fire-up.html#gimp-concepts-running-language

Might be related:

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Even if I think LANG=de gimp is better (if it works), don’t you need && instead of & here?

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It could be that it is related …
None of the previous solutions work.
Pity…
But maybe the mistake will be found.
I just want to exclude that it is up to my Linux system.