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Remove requests to 'idx_storage.content_language_get'.

Description

Remove requests to 'idx_storage.content_language_get'.

It's broken since swh.indexer.storage v0.3.0, as it now returns attr objects
instead of dicts:
https://sentry.softwareheritage.org/share/issue/892044828a09460cab28283afc926cde/

And it wasn't very useful anyway (it barely contains results for any content),
so I'm removing this code entirely.