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Everyone has different ideas for how concpet_name_tags should be used. (Folksonomy vs predefined). As we don't have a use-case for it yet, we're going to delay implementation of concept_name_tag
Rename concept_name.system_tag --> concept_name.concept_name_type for less confusion about the name
Make methods like Concept.setNameAsPreferred(ConceptName, Locale), Concept.addSynonym(ConceptName, Locale),