Updates for Tajik language

New additions translated into Tajik!
Merge pull request #277 from Ibragimov/master

Translation updates for Tajik Language
Support large dictionary files; indexing speed improvement
MDict: handle malformed resource link without quotes
MDict: localizable article loading error string.
Merge pull request #278 from timonwong/mdict_large_file

MDict: Support large dictionary files; indexing speed improvement
Updated French translation - TextToSpeech section
Merge pull request #279 from virtualtam/master

Updated French translation - TTS section
Update Argentinian Spanish translation
Fix typos in translation
Update simplified chinese translation
Merge pull request #281 from timonwong/zh_CN

Update simplified chinese translation
Update belarusian translation
Merge pull request #284 from quendimax/master

Update belarusian translation
Aard: localizable article loading error string
Win-specific: Fix Ctrl+Ins pass-through in hotkey wrapper
Win-specific: Fix Ctrl+C emulation pass-through in hotkey wrapper
Updated French translation - fixed typos, more natural accelerators
Merge pull request #287 from virtualtam/master

Updated French translation
MDict: Fix anchor name/id enclosed with single quotes