Update belarusian translation
Merge pull request #335 from quendimax/master

Update belarusian translation
Allow to collapse/expand articles; auto collapse for big articles (issue #331)
Lupdate all translations, update Russian translation
Adjust Modern and Lingoes-Blue styles to handle expand/collapse buttons better
Update Simplified Chinese translation.
Fixed a regression in Lingoes style, adjusted the Expand/Collapse icons to look similar to Lingoes