As T270263 is merged now, The L10n bot created lots of translation in many languages in the tool, So more languages needs to be added in the tool's drop-down list.
For getting an idea on how to add more languages, Please take a look at this patch: https://gerrit.wikimedia.org/r/650806
Helpful resources:
If you need any help, please feel free to comment here, happy to help you!