no-jira: remove the QTI 21 course element and enhance the IQTestCourseNode to handle QTI 1.2, 2.1 and Onyx

OO-1575: fix wrong for attribute some disabled element, for date chooser, render hour and minute for disabled date chooser element, escape blank in Confluence URL...

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)...