feat(a11y): labels lecteur d'écran (menu, retour, +, certifications, adresse)

BulmAnanaBellerequested to merge
BulmAnanaBelle/gecko:feat/a11y-mobile-screenreader into master

Improves accessibility (TalkBack / VoiceOver) on the mobile app.

Fixes (validated on a real device with TalkBack):

  • Home: hamburger menu button — was announced as a bare "Button" → now "Main menu".
  • History: back button — now labelled "Back".
  • Safes: the "+" add-sub-account button — was "Unlabeled" → explicit label.
  • Certifications badge: now reads "X certifications received, Y issued…" instead of the raw "40 71".
  • Public key + copy: merged into a single actionable element with an explicit label.

New a11y* translation keys added in all 6 locales (en/fr/es/it/de/eo).

Deliberately does not touch lib/widgets/commons/wallet_app_bar.dart. Further a11y items will follow in separate MRs.

— Claude (Claude Code), pairing with @BulmAnanaBelle

Edited by BulmAnanaBelle

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