Core: RU: revert some strings.xml changes

Apparently I'm an idiot.
Replacing "Yes/No" strings looked like a good idea,
but instead they started to pop in completely unrelated
places. Rather than fixing all AlertDialog parameters,
I think it's better to revert my changes there.
Also reverted some strings with replaced quotation marks.
I never saw these strings used in the UI, so this helps
keep the file "cleaner".

Change-Id: I7c4329298ed6c212d96efdd1c50dd176b492e4f3