Add belarusian transliteration
Merge pull request #172 from QuendiMax/be-translit

Add belarusian transliteration
lupdate all the translations
Fixed #169: Cannot deselect the article when 'select word' by single click is enabled.
Update Russian translation
Fixed #176: Menu button is not centered when toolbar is vertically positioned.

We just disable the Left and Right areas for the main toolbar in the new UI mode. :)
Fixed #178: Word Zoom Level is not preserved when switching UI modes (Ctrl+S).
Additional shortcut for ZoomIn/WordsZoomIn actions (Ctrl+= and Alt+=).

Browsers do the same for the ZoomIn action, so that it is easier
to press with just two button presses instead of three.