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