…each language when "all" is specified

This change introduces a new feature where, if the user specifies "all" for the language option, the script now selects the highest quality audio track available for each unique language present in the title's audio tracks. This ensures that users who want to download audio tracks in all available languages get the best possible quality for each language. Previously, the script would either exit with an error if a specific language was not found or only process audio tracks in a single language. This enhancement makes the tool more versatile and user-friendly for scenarios where high-quality audio in multiple languages is desired.

Cleanup unnecessary use of list, set, dict around a generator expression to get an object of that type since there are comprehensions for these types.

And fixed formatted string passed to logging module

Change naming scheme as -l best seems easier to understand than -l all

We create a new list ``video_languages`` that includes all elements from ``v_lang`` or ``lang`` except for the "best" keyword.
Then, we use this new ``video_languages`` list to filter the video tracks, ensuring that the "best" keyword doesn't interfere with the selection process.