When adding a new language to a project, you must add the same language to the Glossary. Failing to do so will result in Glossary terms being unavailable to translators in the CAT tool as a consequence.
To add a new language to a Glossary:
Go to Account Settings (click your account name) > Linguistic Assets
Under Assets, click Glossaries
Click the ellipsis on the Glossary you want to add the new language to
Click Add Language
Choose from the dropdown list of all supported languages
To confirm, click Add Language
Tip: When the new language has been added to the Glossary, consider translating Glossary existing terms into the new language.