This fixes an issue where any string for an enum site setting
(such as TrustLevelSetting) would be converted to an integer
if the default value for the enum was an integer. This is an
issue because things like "admin" and "staff" would get silently
converted to 0 which is "valid" because it's TrustLevel[0],
but it's unexpected behaviour. It's best to just let the site
setting validator catch this broken value.
It's very easy to forget to add `require 'rails_helper'` at the top of every core/plugin spec file, and omissions can cause some very confusing/sporadic errors.
By setting this flag in `.rspec`, we can remove the need for `require 'rails_helper'` entirely.
Refactors `TrustLevel` and moves translations from server to client
Additional changes:
* "staff" and "admin" wasn't translatable in site settings
* it replaces a concatenated string with a translation
* uses translation for trust levels in users_by_trust_level report
* adds a DB migration to rename keys of translation overrides affected by this commit
