fix(react): address Doctor findings (#1143)

Accessibility/semantics pass aligned with React Doctor: role-based spans/divs become real buttons, role=status becomes <output>, modals use native <dialog>, author/peer flags render as <img>, and embed/challenge iframes are sandboxed. Includes review follow-ups: correct button chrome/centering/themed dialog colors and focus rings, the missing aria-label i18n keys (all languages), the Yandex image-search URL, clearer .bso setup steps, a keyboard-accessible image-search dropdown, and removal of the post-edit ('comment edited') display (mod edits unchanged).

public/translations/nl/default.json

@@ -144,10 +144,6 @@
   "show_worksafe_boards_only": "Toon alleen Worksafe boards",
   "show_all_content": "Toon alle inhoud",
   "link_type": "Link type",
-  "comment_edited_at_timestamp": "Reactie bewerkt op <1>{{timestamp}}</1>",
-  "reason_reason": "Reden: \"{{reason}}\".",
-  "click_here_to_show_original": "<1>Klik hier</1> om de originele te tonen.",
-  "click_here_to_hide_original": "<1>Klik hier</1> om de originele te verbergen.",
   "loading": "Laden",
   "posted_by": "Geplaatst door",
   "by": "door",
@@ -393,5 +389,13 @@
   "go_to_settings_to_import_mod_account": "Ga naar <1>instellingen</1> om je mod-account te importeren",
   "post_form_rules_faq_prompt": "Lees de <rules>Regels</rules> en de <faq>FAQ</faq> voordat je plaatst.",
   "pending_mod_approval_reason": "AI-moderatie heeft dit bericht naar de moderatiewachtrij gestuurd. Reden: \"{{reason}}\".",
-  "flag": "Vlag"
+  "flag": "Vlag",
+  "show_replies": "antwoorden weergeven",
+  "hide_replies": "reacties verbergen",
+  "unhide": "weergeven",
+  "account_data": "accountgegevens",
+  "ban_duration_days": "banningsduur in dagen",
+  "challenge_answer": "antwoord op uitdaging",
+  "ban": "verbannen",
+  "timestamp": "tijdstempel"
 }