Backup Weblate configuration

Before the Weblate update and even systematically we should backup the weblate configuration somehow. Maybe it can be saved to translate-server.git or anywhere sysadmin internally?

Parent Task: #11759 (closed)

Related issues

Related to #15651 (closed)

Original created by @u on 15406 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information