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/mr/default.json

@@ -144,10 +144,6 @@
   "show_worksafe_boards_only": "केवळ कामसुरक्षित बोर्ड्स दाखवा",
   "show_all_content": "सर्व सामग्री दाखवा",
   "link_type": "लिंक प्रकार",
-  "comment_edited_at_timestamp": "<1>{{timestamp}}</1> ला संपादित केला",
-  "reason_reason": "कारण: \"{{reason}}\".",
-  "click_here_to_show_original": "<1>येथे क्लिक करा</1> मूळ पाहण्यासाठी।",
-  "click_here_to_hide_original": "<1>येथे क्लिक करा</1> मूळ लपविण्यासाठी।",
   "loading": "लोड होत आहे",
   "posted_by": "ने टप्पल केला",
   "by": "व्यक्ती",
@@ -393,5 +389,13 @@
   "go_to_settings_to_import_mod_account": "तुमचे मॉड खाते आयात करण्यासाठी <1>सेटिंग्ज</1> वर जा",
   "post_form_rules_faq_prompt": "पोस्ट करण्यापूर्वी <rules>नियम</rules> आणि <faq>वारंवार विचारले जाणारे प्रश्न</faq> वाचा.",
   "pending_mod_approval_reason": "AI मॉडरेशनने ही पोस्ट मॉड कतारमध्ये पाठवली. कारण: \"{{reason}}\".",
-  "flag": "ध्वज"
+  "flag": "ध्वज",
+  "show_replies": "उत्तरे दर्शवा",
+  "hide_replies": "उत्तरे लपवा",
+  "unhide": "दाखवा",
+  "account_data": "खाता डेटा",
+  "ban_duration_days": "बंद मुदत दिवसांमध्ये",
+  "challenge_answer": "आव्हान उत्तर",
+  "ban": "प्रतिबंध",
+  "timestamp": "टाइमस्टॅम्प"
 }