## Description
Weblate's Android string parser (aka
https://translate.codeberg.org/projects/wholphin/) doesn't support
direct translations of string arrays.
Many of Wholphin's preference options are defined in string arrays and
therefore could not be translated. So this PR implements the [suggested
workaround](https://docs.weblate.org/en/latest/formats/android.html) to
move the string into individual entries and reference them in arrays.
Also moves some hardcoded strings into `strings.xml` so they can be
translated. Note: virtually all error messages are still hardcoded, but
they are only for exceptional cases, so it's probably not a huge
problem.
A minor bug where the backdrop would show briefly after switching users
is fixed.
### Related issues
Fixes#957
### Testing
Emulator
## Screenshots
N/A
## AI or LLM usage
None
2a371e7d6b