Remove title attributes: Plugins and (Network) Themes updates

[afercia]

See related #24766 and all the following tickets about title attributes.

In the Plugins and (Network) Themes list tables, when there are available updates, a title attribute is used on the "View version details" link to reference the Plugin or Theme name. See screenshot:

I'd propose to simply remove the title attribute and use an aria-label attribute to expand and override the link text. Also, the "update now" link should be expanded with an aria-label attribute to make sense also when read out of context.

[afercia]

The proposed patch uses aria-label attributes where appropriate and adds translators comments.

[afercia]

Refreshed patch fixes some typos in the translators comments.

[afercia]

In 36032:

Accessibility: Remove title attributes from the updates links on the Plugin and Themes list tables.

Adds aria-label attributes on some links and on the "update nag" link. Adds translator comments.

Fixes #35167.

[ramiy]

@afercia, please see this related ticket - #36048.