✨(frontend) make dropdown menu and language picker accessible

[Ovgodd]

Purpose

Improve accessibility and usability of the dropdown menu and the language picker while keeping a fully custom trigger (no MenuTrigger), in order to maintain visual flexibility and design consistency.

issue : 1428 / lang : 898

Proposal

Improve keyboard interaction support (Enter, Space, ArrowDown) to open the menu.

Update menu items to use visible labels only (no aria-label), and apply the lang attribute directly on the text span to ensure correct pronunciation for each language.

Remove redundant or conflicting accessibility attributes (e.g. aria-label overriding visible text).

Maintain compatibility with the custom LanguagePicker, which now reuses this accessible DropdownMenu component.

• Keep a custom accessible trigger instead of using MenuTrigger, allowing us to embed any custom design (icons, button, text, etc.) while keeping full ARIA compliance.
• Improve keyboard interaction support (Enter, Space, ArrowDown) to open the menu.
• Update menu items to use visible labels only (no aria-label), and apply the lang attribute directly on the text span to ensure correct pronunciation for each language.
• Remove redundant or conflicting accessibility attributes (e.g. aria-label overriding visible text).
• Maintain compatibility with the custom LanguagePicker, which now reuses this accessible DropdownMenu component.

Before → announced as

"Select language, bouton"
(generic button, no indication of menu or submenu)

After → announced as

"cliquable Français arrow down drop boutton , bouton de menu, réduit sous menu
(explicitly identified as a menu button with submenu, including current language labe

[AntoLC]

I think I let the hand @PanchoutNathan for this one, seems a "big" refacto on a important component, I don't feel totally safe to review it without testcase.

[Ovgodd]

I think I let the hand @PanchoutNathan for this one, seems a "big" refacto on a important component, I don't feel totally safe to review it without testcase.

Of course, I will be glad to talk about it @PanchoutNathan if you need it !