Basic form i18n for Russian Language

Some of translations maybe need to be discussed, because of some
translations are not literal.
Fixed typo in module name
Fixed function name

Sorry friends, I’m so inattentive!
Corrected `ValueRequired` translation
Fixed cabal file

Added Russian form translation as exposed module in .cabal
Merge pull request #784 from geraldus/form-i18n-ru-temp

Basic form i18n for Russian Language