You coded many things statically in the new, modern UI, like languages and categories which were dynamically retrieved in the old extjs UI (for example from /api/epg/content_type/list). Make sure everything that was dynamically retrieved before is stil...

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

You coded many things statically in the new, modern UI, like languages and categories which were dynamically retrieved in the old extjs UI (for example from /api/epg/content_type/list). Make sure everything that was dynamically retrieved before is still dynamically retrieved now (languages, categories, channels, channeltags and so on). You need to look at all of the old js source files and read through them completely to make sure that you do not miss anything. I understand this is a complex task, please do it anyways.

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