OlafHimmelberg in the DB I find under the settings nothing that indicates the language, so I can not change or adjust anything.
In the settings table there is a key named extensions_enabled
, its content looks like:
["flarum-emoji","flarum-likes","flarum-lock","flarum-markdown","flarum-mentions",...]
Here you should add the language pack you wish to enable / activate. As you can see, the order doesn't matter, so you can put it at the beginning like:
["flarum-lang-english","kakifrucht-flarum-de",...]
I'm not 100% sure of the naming of @Kakifrucht's extension, but English at least should be OK.