Change Details

**Problem:** Currently any input is accepted for the language of a Gloss. We should restrict this in order to make it easier to re-use and to be able to do language fallbacks etc. **Acceptance criteria:** * I can not enter a language for a Gloss that is not in the list we validate against (list of label languages). * I can enter any language that is on the list we validate against. **BDD** GIVEN I am on a Lexeme page AND I edit a Gloss WHEN I enter a language that is not considered valid THEN the field is highlighted in red AND the save button is grayed out

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