Large portion of corrections related to the localization

Added found strings for translation
moved html tags and spaces
Removed translation, where it is not you need to
Rebuilt all po files
Superior RU translation

Now I feel good. I fixed everything that I wanted.
I think you can't get rid of these keys, as we use the names of these fields to index for search inside the Options dialog.

I'll test on your branch and see if this doesn't break now.