PLF-5917:Ensure that all the endRequest methods will be called despite whatever happens

Fix description
* Add EndRequest in finally block .
* Check if the user was already synchronized before invoking membership
Crowdin injection w25 (from 20140617 to 20140620)
Merge commit '54bab8e7276d7fad8e715a4414b8bb1f6e773a2f' into HEAD