Remove the `title` attribute from markup generated in `wp-includes/category-template.php`:

* `get_category_parents()`
* `get_the_category_list()`
* `wp_generate_tag_cloud()`
* `Walker_Category::start_el()`	

Props joedolson.
Fixes #26557.	



git-svn-id: https://develop.svn.wordpress.org/trunk@28359 602fd350-edb4-49c9-b593-d223f7449a82