HaikuDepot: Rework Languages Handling

Tidy up of the languages model handling.

Change-Id: Ie9f93dab0a91b4598da87e58cb065fc5272a7b74
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7925
Reviewed-

HaikuDepot: Rework Languages Handling

Tidy up of the languages model handling.

Change-Id: Ie9f93dab0a91b4598da87e58cb065fc5272a7b74
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7925
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

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