ECMS-4199 Content Explorer: Error on Relation Panel of WAI Portal's home page
Problem analysis: Reason of above problem is due to hard-coded uuid of language symlink from xml deployment file.
Fix description:
* For creating new portal: add plugin AddTranslationPlugin for adding translation when creating new portal.
* For upgrading existing WAI portal: using WaiportalTranslationsUpgradePlugin to make language symlinks correct.