Translation updates for Tajik Language
Merge pull request #262 from Ibragimov/master

Translation updates for Tajik Language
Update Dutch translation (by Cris)
Update Polish translation (by Grzegorz Karpowicz)
Merge branch 'win-tts' of git://github.com/timonwong/goldendict into win-tts
1. Use mingw headers to access Speech API, don't use MS VC and extra library
2. Fix compilation under Linux
Create SpeechHelper without enum available tokens