Describe the bug
I have updated Vorta to the latest 0.7 release. My Mac is set to English as the primary language (see menu bar). German is setup as a secondary language. Vorta shows everything in German though, this did not happen with the release before 0.7.
To Reproduce

Desktop (please complete the following information):
Vorta and Borg versions can be found in Main Window > Misc Tab
Additional context
If appropriate include logs. Can be found in Main Window > Misc Tab > Log.
Can't reproduce this. Which locales are loaded as per your logs? (Misc > Log)
2020-09-07 20:22:05,681 - vorta.i18n - DEBUG - Loading translation succeeded for ['en-US', 'de-US'].

2020-09-06 15:40:44,610 - vorta.i18n - DEBUG - Loading translation succeeded for ['en-AT', 'de-AT'].

I see. You are using "Austrian English", while our source language is US English. So it falls back to German in weird ways. See here.
I've renamed our source language to just en from en-US. For me this fixes the issue, even with en-AT.
TIL that Austrian English is a thing
Ah ok - thanks! I guess it's "Austrian English" because of the region setting 馃槄
Does this fix other languages also? My macOS keyboard/Input source is Dutch, and my system language is English. Vorta 0.7.1 gives me a German UI...
Logs please. German isn't hardcoded anywhere. Might be somewhere in your locales. Or an issue with Qt detecting it.
Most helpful comment
TIL that Austrian English is a thing