[MERGE] gamification, website_slides{_survey}: add certification badges section to ranks badge page

This merge adds a section to distinguish the certification badges from the
other badges users may obtain in eLearning. Certification badges are available
on the ranks page, linked to a running survey. Clicking on them directly
redirects into the linked course.

Other commits in this merge include

  * renaming a category field on challenge to challenge_category to ease
    its finding in code;
  * renaming some statistics fields on badge model to ease its understanding;
  * various usability improvements and fixes;

Task ID : 1961053
PR #32594

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

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