fix reset password link
admin can set admin field to another user
add method to backtrace in mails
Merge branch 'feature/admin-management-45302' into develop

* feature/admin-management-45302:
  admin can set admin field to another user
Merge branch 'feature/reset-password-44933' into develop

* feature/reset-password-44933:
  fix reset password link
fix watcher select
move email regexp to config
show 'Please use corporate email' if Errbit::Config.corporate_emails is true
fix pjax loading in production
Merge branch 'feature/configure-email-format-47130' into develop

* feature/configure-email-format-47130:
  show 'Please use corporate email' if Errbit::Config.corporate_emails is true
  move email regexp to config