Should be possible to override translations using config file

Suggested Implementation

• Modify module-config to process a new top-level config key, "Translation overrides." Consult ibacher about the right way to do that. My advice is to follow the example of what he did with "Display conditions": add to the "enhanced schema", handle that piece of the config specially (by adding translation overrides to an overrides store), delete that piece of configuration from the normal `getConfig` tree before returning. The piece of enhanced schema should probably be

{
  "Translation overrides": {
    _default: {},
    _type: Type.Object,
    _elements: {
      _type: Type.String
    },
    // if you can create a validator that checks that the translation keys provided actually exist in the translations file that would be very cool and helpful
  }
}

• Modify the i18next loader here to merge the requested file with the overrides store

There is a possibility that the system will need to be more elaborate, since this means that translations shouldn't resolve until the config is loaded.

See https://openmrs.slack.com/archives/CHP5QAE5R/p1646332735304489?thread_ts=1646331669.301989&cid=CHP5QAE5R