fix(web): clarify some transcoding settings

[meesfrensel]

Description

Clarifies the maximum bitrate setting mentioned in #21915 and the temporal AQ description.

I also updated the Dutch translation, not sure if that's allowed like this or that it should happen strictly through weblate.

Fixes #21915

How Has This Been Tested?

Not relevant

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in the PR.
• I have confirmed that any new dependencies are strictly necessary.
• I have written tests for new code (if applicable)
• I have followed naming conventions/patterns in the surrounding code
• All code in src/services/ uses repositories implementations for database calls, filesystem operations, etc.
• All code in src/repositories/ is pretty basic/simple and does not have any immich specific logic (that belongs in src/services/)

Please describe to which degree, if any, an LLM was used in creating this pull request.

None

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