How can I deactivate the spell checker in Aeon Timeline 2?

What has bothered me for a long time: In Aeon Timeline 2 (Windows) my German text in the text input fields is underlined in red. Apparently an English spell checker is active. How can I turn it off?

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Just in case anyone else has the same problem: I was able to solve it myself by deleting this file:

C:\Program Files (x86)\Aeon Timeline 2\locales\en-US.pak