Migrate the existing checker / suggester code to instead use the new validator framework. We need to add,
- Printf validator (insertable but not enforced)
- Brace balance validator (insertable but not enforced)
- HTML insertables suggester
We'll need to update the YAML configuration file located here - https://phabricator.wikimedia.org/diffusion/GTWN/browse/master/groups/
Documentation: https://www.mediawiki.org/wiki/Help:Extension:Translate/Validators
Example patch: https://gerrit.wikimedia.org/r/c/translatewiki/+/549930