* Rework language service and API
* Revert unintended commit of Directory.Build.props
* Create OS conditional test for invalid ISO codes
* Reintroduce and obsolete old Delete method on ILocalizationService + make new Delete method delete by ISO code + add obsoletion attrs to service implementation
* Review comments + utilize new Delete method
* Do not allow model reuse when creating a new language
* Fix bad merge
* Split localization service into dedicated services for language and dictionary item handling
* Replaced ILocalizationService usage in management API (as much as can be done for now)
* Ensure we can create dictionary items with explicit keys (but no duplicates)
* Fix culture controller so it works properly with pagination
* Update OpenAPI JSON
* Actually update the language being updated...
* Unit test for invalid ISO now no longer needs to differ between OS :)
* A little bit of code health improvements
* A litte less code duplication
* Remove duplicate validation
* Rework dictionary CRUD operations
* Update OpenAPI json
* Move responsibility to localization service, introduce new attempt pattern for create and update operations, update unit tests accordingly
* Fix merge
* Rollback assumption that we can map entities from scratch (entity relations got in the way)
* Update OpenAPI JSON
* Add breakage supressions
* Add compat suppressions for integration test project
* Make dictionary item deletion follow same pattern as create and update
* Review comments + update delete to use new pattern
* Update breakage suppressions to match the new Delete method
