Merge master into feature/stabilization.
SOC-3169 Explanation of the registration field doesn't change

Fix description: use class ".btn" instead of "a" tag, so UIForm can update element.
SOC-4036 : Update version of kernel | core | jcr | ws | gatein to be compliant with plf-4.x
Crowdin injection w51 (Arabic file on 20131217)
SOC-3249 | [Profile] Feedback about Edit Experience.
SOC-3439 Space menu disappeared after renaming space

Fix description:
* Get the updated node from its parent to make sure the updated node is not null.
SOC-3446 | An empty app category display name impacts spaces creation(NPE, corrupted database)
SOC-3486 Encoding problem in Social Status Message. Commit on to master.
SOC-3553 | [IE] Duplicate alert message after editing a space.
SOC-3556 Show "The target block ID to update is not found : UIComposer" when switch view mode with  User Activity Stream Portlet

Fix description: only add trigger or find element LinkExtensionContainer when UIComposer.clickOn is null and UIComposer.clickOn doesn't have class uidocactivitycomposer.
Merge branch 'feature/stabilization'