* Add support for overriding strings in the app
This is to support a case where certain details of the app need to be slightly different and don't necessarily warrant a complete fork.
Intended for language-controlled deployments, operators can specify a JSON file with their custom translations that override the in-app/community-supplied ones.
* Fix import grouping
* Add a language handler test
* Appease the linter
* Add comment for why a weird class exists
