OR-728 rework JS and CSS injections data and add a new injectAngular method

Conflicts:
	frontend/js/esn/app.js
OR-728 fix community widget to invite members which was hiding the community-injection widget
Merge pull request #546 in OR/rse from ~SLEMAISTRE/rse:OR-728 to master

* commit 'ad43273c80eb4e372a8293586bfadaf14f86ab6a':
  OR-728 fix community widget to invite members which was hiding the community-injection widget
  OR-728 rework JS and CSS injections data and add a new injectAngular method