Allow wiki i18n
bg "български език" translation #1850. Author: Anonymous.
don't translate wiki slugs
Merge branch 'stable' of github.com:ornicar/lila

* 'stable' of github.com:ornicar/lila:
  don't translate wiki slugs
  bg "български език" translation #1850. Author: Anonymous.
  Allow wiki i18n

Conflicts:
	app/controllers/Wiki.scala
	app/wiki/Api.scala
	app/wiki/Page.scala
	app/wiki/PageRepo.scala
	modules/wiki/src/main/Fetch.scala
move app/ to src/main (?!)