* Remove title attributes.
* Show "Install Now" and "Details" links if the importer isn't installed yet.
* Show a "Run Importer" link if the importer is installed. It also handles activation if the plugin isn't activated.
* Add `aria-label` attributes to each link.
* Unify the importer descriptions to make them independent from the plugin state. The API was changed in [meta3690].
* Adjust JavaScript callbacks for ajaxified importer installs.
Props afercia, swissspidy, ocean90.
See #24766.
Fixes#35191.
git-svn-id: https://develop.svn.wordpress.org/trunk@38075 602fd350-edb4-49c9-b593-d223f7449a82