On my german Windows10, I want to use SourceTree in english language. Reason for that is, that I don't want to use translated git commands in the menu like "Zweige" for "Branches".
Anyway, it's possible to change the language from "Auto" to "Englisch" which is fine for me.
However, after each version update of SourceTree, the app is started in german language again. Funnily, the language dropdown in settings still shows english. So I don't change anything, just click OK, restart SourceTree and it's english again.
I would rather prefer not to do that after every update.