OO-991 i18n, xss, fix filename in download, add mail form for coach, improved status feedback, allow submission without documents, add missing identity to created files

OO-1443: upgrade selenium to version 2.46 which is much quicker as 2.45 and fix an issue with Firefox 38, fix a race condition in the business gorup tree which make the links unusable, fix a upper/lower case issue if the selenium tests are run with PostgreSQL

no-jira: make the group task coure element for owner only, fix RS if there isn't any "next step", french wording, remove visit entirely, add member icon (Font Awesome 4.3)...

OO-1567: hardened the user name's cache against null, show a string as author if the feed author user name is null

OO-1562,OO-1563: add a member management right to the list of course rights and restricts the access to the function of the course members management in function of the administration/group/member rights

OO-991: allow grading with only comments to user, enhance the group assessment panel to manage comments, wording...

OO-991: fix an issue with enable/disable in tabbedpane component, add embedded editor for tasks / solutions, add author / uploader in a lot of places, wording for relatives dates in workflow