Metadrop: How to mark foreign words for accessibility in Drupal with the CKEditor Language plugin

The European Accessibility Act came into force in June 2025, raising WCAG AA compliance from a best practice to a legal requirement for most web projects in the EU. Among the criteria that standard covers, WCAG 3.1.2 is one of the most consistently missed in editorial workflows: it requires that any change of language within a page be identified in the markup. Content that mixes languages is nearly universal, since any site writing in Spanish will borrow English terms, and any site writing in English does the same in the other direction.