Add "isaudiobook" string to Album overview page

Feature description

Would it be possible to make the isaudiobook string usable in the Album page?

Problem solved

Unable to have Album page’s strings (Subtitle and Secondary Info) use conditions based on the Audiobook media provider toggle

Brought benefits

Information displayed for music albums may not be useful for audiobook albums, and vice versa. Examples include Label (for Publisher), Composer (for Narrator), etc.

Having this string available would allow us to condition based on the library type instead of relying on the ReleaseType.

Device type

Phone

Additional description and context

AFAIK albums are never merged if they are from different providers/libraries, so there shouldn’t be any issue with one album having multiple values for isaudiobook

My goal is simply to have my albums from normal libraries display their ReleaseType, while albums from my Audiobook library display their Grouping.

I searched existing feature requests

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