add bing langauge code
Merge branch 'master' into multilang-v2
add entry language data
add IsCurrent flag for LanguageEntry
modify GetEntry API
Merge branch 'master' into multilang-v2
Merge branch 'master' into multilang-v2

Conflicts:
	data.go
Merge branch 'master' into multilang-v2
add get Knowledgebase overview api
add update knowledge overview
Merge branch 'master' into multilang-v2
add language code for wiki section
add switch wiki section version api
Merge branch 'master' into multilang-v2
add Localed Map
add api for machine translations for wiki section
add api for mannual translate entry
update entry and knowledge overview data
add get wiki section transalte form api
add IsAllTranslated for Entry and kNowledgeoverview data