Clarified and fixed some things in dev-guide
Minor fixes in dev-guide
Added Jar package generation to INSTALL
Added migration problem to TROUBLESHOOT
Added Traditional Chinese translation, thanks to Jeremy Lam
Added zh_TW zh_HK instead of zh-Hant
Sitemap transaction added of group counts. Continuation of #286
Added Chocise César to the CREDITS (thanks for start with the Brasilian Portuguese translation of kune)