* Implement atomic user challenges update
Prevents multiple concurrent requests from passing through
Fixes#11295
* Move user challenges update to separate method
* Rename challenge syncToUser to syncTasksToUser
Now that adding the challenge to user is separated, this methods main purpose is to sync the tasks
* Fix lint errors
* make comment more accurate: members are removed, not banned
They can rejoin with an invitation in a private group or at any time in a public group.
* change windows line breaks to unix line breaks
* change flavour text of Golden Knight collection quest to reduce number of testimonies
* fix grammatical error noticed by mandyzhou
* improve message about not being able to send PMs because we often see people report it as a bug
* update instructions for cancelling Google subscriptions (thanks to Scea for noticing)
* change Delete Completed on-hover message - fixes#8598
* correct the Orb of Rebirth's text about pets and mounts (they are not locked)