As a user I want to perceive and operate checkboxes in the Catalog and Articles Datastores

[bnhowell]

• For checkbox elements in Catalog and Articles 'Filter your search' sections, use role="checkbox" for those element to also have a aria-checked attribute to expose the checkbox's state to assistive technology.

Example 1: Adding the checkbox role in ARIA

role="checkbox" aria-checked="false" tabindex="0" id="chk1">
Remember my preferences<span

[jonearley]

Please search for similar issues before creating new ones. This is a repeat of #113.