OO-1261: improved navbar collapse for sites/tabs/tools, tab text overflow handling in css, configurable icons for tabs

OO-1263: refactor user tools to include print, search, imprint, chat and helper, use only the off canvas menu...

OO-1254: implements email, recertification, confirmation for new certification before recertification period, assessment tool without assessable course elements...

OO-1282: rewrite the reload method to accept nothing as a result without error ( and connection set to rollback )

OO-1276: course administrator and course tutor have access to the results of the course participants

OO-1278: the change executor must be the first in the chain of login interceptors (it don't need any GUI)

no-jira: add external reference and id of courses in the list of membership of users in the user administration

OO-1254: first push! implement management for the template at system level, generation of certificate, notifications, certification in assessment tool, auto certification, course configuration (no recertification at this time! )

OO-1253: not asssessable nodes and not published nodes return a score of 0.0 instaed of the large negative number. If not assessed, no score seems logic but not a large negative value

OO-1251: return a copy of the list of enabled language to prevent concurrent modification red screens