Update references to audio works to use "audio track(s)"

[sarayourfriend]

Problem

In #3941 we established a convention of referring to audio works/results as "audio tracks" rather than just "audio". While "audio" is indeed a singular and plural noun, it has a strange feeling as a noun. Using the phrase "audio tracks" reads better.

Description

Update existing references to audio works to use the new convention "audio track(s)".

Additional information

All of the English text in Openverse is contained in en.json5:

https://github.com/WordPress/openverse/blob/aa9ea4bcfe40683923c98ca43b23f6ff22a06a2f/frontend/src/locales/scripts/en.json5

To fix this issue, you would need to find occurrences of "audio" that refers to "audio tracks", and replace it with "audio track".
Here, we would replace audio with audio track:
{hero: { description: "An extensive library of free stock photos, images, and audio, available for free use." } }
But here, replacement is not needed:
"This audio format is not supported by your browser."

[Collins-Webdev]

Hello @sarayourfriend ,
I made a pull request about it here.

Please review the changes and let me know if there are any further adjustments needed. Thank you for considering my contribution.

[obulat]

Fixed in #4037