When you exclude a language from your projects, you may also want to remove the corresponding language from the existing glossary.
To update your glossary's languages in Transifex and remove a specific language, please follow these steps:
In the downloaded .csv file, remove the column corresponding to the desired language. If you have a column containing notes specific to that language, remove it as well, and save the changes.
Upload the updated .csv file to Transifex as a new glossary.
Once the new glossary is created, assign your project to this glossary. If desired, you can delete the previous version of your glossary.