[TaxonomyConverters, WebPartHelper]
- Pimped out taxonomy value converters to make sure they create TaxonomyValue objects which have the Label in the CurrentUICulture (converters now collaborate with ITaxonomyService, so I needed to change the DI registrations a little bit to inject the converters themselves)
- Corrected WebPartHelper method that helps with inserting a WP in a rich text field