Merge pull request #481 from sergeyklay/master

Assests::popup
Updated feature #169: Added Gravatar config
Updated translation: Amended Russian
Fixed issue: Added i18n support to user form
New feature: Added User::getAvatar with optional Gravatar support
Updated feature #169: Added Gravatar support
Updated feature: Added new View for user avatar to profile template
Updated feature: Cerber Theme
Fixed issue: Fixed gravatar check
Update feature: Fixed default gravatar size
Fixed issue: Fixed Gravatar URL
Fixed issue: Fixed User::getAvatar