Renaming comments templates
It's now possible to edit comments

Related to #120
Check rights before editing comment

Related to #120
Force updating with fresh data when object edited
It's now possible to cancel comments creation/edition

And now save buttons are right-aligned

cf #120 and #124
Swap issue-body edit button

Fixed #124
It's now possible to delete comments !

Fixed #120
Add space after the avatar in the repo switcher

Fixed #100