Support chinese zh-hans and zh-hant

Additional info: https://www.deepl.com/en/blog/deepl-translator-now-supports-traditional-...

@cyrille.miskiewicz: Feel free to add a MR adding the new language.

cyrille.miskiewicz → changed the visibility of the branch 3483438-support-chinese-zh-hans-zh-hant to hidden.

Patch is working, but phpunit test fails because :
"Unable to install modules: module 'tmgmt_deepl_test' is incompatible with this version of Drupal core." (11.0.5)

I'll have a look on the issue. Looks like the configuration of the unit tests needs to be updated.