Add spans to archive titles

[shireling]

There are times when it's helpful for users to be able to modify archive page titles with CSS - sometimes people want to hide the Category: part of a Category: Press Releases title, for example.

If we added <span> tags to the two parts of that string by filtering get_the_archive_title() that kind of modification would be possible without needing a plugin or child theme.

[swissspidy]

Duplicate of #38545.

[shireling]

Thanks @swissspidy - missed that!