* More admin checks

# Conflicts:
#	packages/rocketchat-lib/server/methods/insertOrUpdateUser.coffee

* missing server side validation

# Conflicts:
#	packages/rocketchat-ui-flextab/flex-tab/tabs/userEdit.coffee

* Remove last admin check for removeUserFromRoom

* Move and fix last admin check for role removal

Check was on change admin status method, but that didn’t catch direct removal of user from role admin view.

* Fix last admin check for insert/update/delete user

Was checking if only one admin but not if the updated user was admin, preventing all updates.

* Allow translation of last admin error

* Fix assigning admin permission bypass