YouTube integration

[loicknuchel]

Connect a Gospeak group to a YouTube channel to allow:

• display channel stats on the group page and link to it
• enable a curation screen that
  • show linked proposals/vidéos (with title of both to quickly check they are correct)
  • show unmatched proposals (not linked to a vidéo) and propose to link to one (using a select ordered by title distance)
  • show unmatched vidéos (not linked to a proposal) and propose to link to one