As a first word I would say that this issue is related to Stack Overflow in Russian only, but implemention the fix for that should be done in general since the code is shared between all international SO sites.
A couple days ago support for black theme was enabled for international SO sites. In any language there is no issue with alignment:
- Portuguese (seems not completely translated yet)
But not in Russian:
Take a look at the middle option "System setting". Since this sentence is wider than icon itself text alignment on the center looks like as to the left alignment.
Can this alignment please be fixed for the strings that are larger than icon representing the current theme?
For instance I see something like this as final solution: