chore(components): update language switch accessible names and roles

[myrta2302]

📄 Description

This PR initial goal was to fix non conformity with the https://www.w3.org/WAI/WCAG22/Understanding/label-in-name accessibility guideline. Instead of modifying the aria-label content this PR replaces the aria-labels set on the contained button elements with descriptive visually hidden span texts. List variant 'role' attrs are modified to correctly recognize list items. An info box is added in the language switch page of the documentation to inform about proper usage of the name language option prop.

📝 Checklist

• ✅ My code follows the style guidelines of this project
• 🛠️ I have performed a self-review of my own code
• 📄 I have made corresponding changes to the documentation
• ⚠️ My changes generate no new warnings or errors
• ✔️ New and existing unit tests pass locally with my changes