fixes
add gem russian
avatar is required
add error to locales
add button to welcome index
add login_validator
replace in migrations strings to text
fix migration
Merge branch 'feature/some_fixes' into develop

* feature/some_fixes:
  fix migration
  replace in migrations strings to text
  add login_validator
  add button to welcome index
  add error to locales
  avatar is required
  add gem russian
  fixes