WCAG 3.1.2: Language of Parts
WCAG 3.1.2 Language of Parts is a level AA success criterion from WCAG 2.0. Passages in a different language are marked, so pronunciation changes for that passage.
A French product name inside an English page is mispronounced if it is not marked.
How to test
Find quotes and names in another language. They should have lang on the element.
How to fix
Add lang on the phrase, for example lang=fr on a French heading.
Example that fails
A French slogan in an English page has no lang.
Example that passes the check
The slogan is in a span with lang=fr.
Shopify
Wrap foreign phrases in the theme or product description with a span and lang.
WooCommerce
Mark foreign phrases in the product text.
WordPress
Use the block language attribute or a span.
Wix
Set the language on that text element if the editor allows, or wrap it in custom HTML with lang.