joedolson d1717e60b9 Administration: Backwards compatibility for new sortable keys.
Replace use of `list` to parse array keys into variables. `list` throws errors if the keys don't exist, and many extenders will not define the new array keys. The code path already falls back effectively for empty values.

Also add translator comments to screen reader hidden text, fix a docblock, and fix an HTML error.

Follow up to [r55971].

Props kebbet, chouby, joedolson.
Fixes #32170.
Built from https://develop.svn.wordpress.org/trunk@56004


git-svn-id: http://core.svn.wordpress.org/trunk@55516 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2023-06-23 17:49:28 +00:00
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