PLF-5859: Activate Czech translations, PLF gadgets
Crowdin injection w15 (from 20140405 to 20140411)
PLF-5381 Content Explorer: Error on Relation Panel of WAI Portal's home page

Fix description:
* Invoke AddTranslationPlugin to add translations for pages when creating new portal.
Merge commit '3a1d3e533626d3398e4306528d895f7776b3581f' into HEAD
Merge conflict with feature/4.0.x-translation