11x nibRealUI\Locale\enUS-Английский (США).lua:10: attempt to index local 'RealUI' (a nil value)
nibRealUI\Locale\enUS-Английский (США).lua:10: in main chunk
and so on for all locales
only 8.1 r17d from 07-23-16 working on russian client
Are you getting any other errors (not counting other locale files)? The error you posted is literally impossible unless something else went wrong.
I just made clean install, deleted my all addons and use only r18e. Works fine, so i think its some kind of addon conflict or something. I will add some more addons that i use and if i get error i will inform you.