remove: lib/task empty dir.
fix: added api_controller#lang_field_cols_html
add: common/EventBarrier.js
fix: refactor EventBarrier.js for arguments, delay complete.
rename: api_controller.lang_field_cols_html to get_lang_html
fix: add 'get_lang_html' to IiApi.js's acceptable action .
bug-fix: tpl render's DOM order bug fixed.
bug-fix: typo.
fix: IiLang.toggleLangType impled. and destroy bug in LangRevisionUpdater fixed.
fix: add LangType::LangInfo and fix menu links.