Add Russian translation

Source: https://github.com/misterDOGG/Stino/commit/99129ca5b22af7172d7eca372bfe59d8a2e42acc
Update French translation
Update Simplified Chinese translation
Update German translation
Update Spanish translation
Update Italian translation
Update Japanese translation
Update Portuguese translation
Fix typo
Update contributors
Update English translation
Merge pull request #214 from gonzoid/translation

Translation maintenance by @gonzoid