Consider removing title attributes from theme list tables

[sabernhardt]

Related: #24766

The old list tables for themes and theme installation include title attributes:

• 'This theme is already installed and is up to date' on 'Installed' spans
• 'Update to version %s' on 'Update' links
• 'Install %s' on an 'Install Now' link
• 'Preview %s' on a 'Preview' link
• 'Preview “%s”' on a screenshot thumbnail image (linked with empty alt)
• 'Activate “%s”'on an 'Activate' link

If sites can still access these list tables, the attributes could be worth removing and/or replacing.

@alh0319 suggested replacing the title with aria-label for the thumbnail image link, but removing the other title attributes.

• Removes title attributes from span elements.
• Replaces title with aria-label for links whose visible text starts with the same word (in English). This is similar to links on the Add Plugins screen.
• Reuses the $preview_title variable to keep ARIA labels consistent for both Preview links.

Trac 62834

[audrasjb]

Hi @sabernhardt and @alh0319 and thanks for the ticket/PR.

I'm always hesitant about using aria-label attributes but in this case:

• first it allows us to keep the complete information previously provided by the title attribute
• it is only adding more information to the displayed string
• it doesn't change any translation string and keep the interface consistent without having to change the stylesheet of these old screens

Thus, I'm gonna move this ticket to milestone 6.8.

[audrasjb]

In 59675:

Themes: Remove title attributes from theme list tables.

This changeset updates the old list tables for themes and theme installation to remove title attributes or replace them with a more acessible implementation:

• Removes title attributes from span elements
• Replaces title with aria-label for links whose visible text starts with the same word, consistently with links on the "Add Plugins" screen
• Reuses the $preview_title variable to keep ARIA labels consistent for both Preview links

Follow-up to [22439], [27548], [31513], [32991], [50804], [53414].

Props karlgroves, sabernhardt, audrasjb, alh0319.
Fixes #62834.
See #24766.

committed in https://core.trac.wordpress.org/changeset/59675