diff --git a/app.py b/app.py
index 159274c..5eaf683 100644
--- a/app.py
+++ b/app.py
@@ -4169,10 +4169,77 @@ def _lang_dropdown_html(lang: str) -> str:
       });
     });
   }
+})();
+  // UI text translation
+  var lang = localStorage.getItem("bsn-lang") || "de";
+  if (lang !== "de") {
+    var uiText =  + '_ui_text_json(lang)' + ;
+    function translateUI() {
+      // Translate text content of elements with specific text
+      var walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT);
+      var node;
+      while (node = walker.nextNode()) {
+        var txt = node.textContent.trim();
+        if (uiText[txt]) {
+          node.textContent = node.textContent.replace(txt, uiText[txt]);
+        }
+      }
+      // Translate input placeholders
+      document.querySelectorAll("[placeholder]").forEach(function(el) {
+        var ph = el.getAttribute("placeholder");
+        if (uiText[ph]) el.setAttribute("placeholder", uiText[ph]);
+      });
+      // Translate button text
+      document.querySelectorAll("button").forEach(function(el) {
+        if (el.textContent.trim() && uiText[el.textContent.trim()]) {
+          el.textContent = uiText[el.textContent.trim()];
+        }
+      });
+    }
+    if (document.readyState === "loading") {
+      document.addEventListener("DOMContentLoaded", translateUI);
+    } else {
+      translateUI();
+    }
+  }
 })();
 </script>"""
 
 
+# ═══════════════════════════════════════════
+# UI-Text-Übersetzungen (via JS + Fallback)
+# ═══════════════════════════════════════════
+UI_TEXT = {
+    "Willkommen in der BSN Community!": {"en": "Welcome to the BSN Community!", "fr": "Bienvenue dans la communauté BSN !", "es": "¡Bienvenido a la comunidad BSN!"},
+    "Nicht mehr anzeigen": {"en": "Don't show again", "fr": "Ne plus afficher", "es": "No mostrar más"},
+    "Alles klar!": {"en": "Got it!", "fr": "Compris !", "es": "¡Entendido!"},
+    "Powered by": {"en": "Powered by", "fr": "Propulsé par", "es": "Desarrollado por"},
+    "Zurück zur Übersicht": {"en": "Back to overview", "fr": "Retour à l'aperçu", "es": "Volver a la vista general"},
+    "Aufrufe": {"en": "views", "fr": "vues", "es": "vistas"},
+    "Kommentare": {"en": "Comments", "fr": "Commentaires", "es": "Comentarios"},
+    "Dein Name (optional)": {"en": "Your name (optional)", "fr": "Votre nom (facultatif)", "es": "Tu nombre (opcional)"},
+    "Schreib einen Kommentar...": {"en": "Write a comment...", "fr": "Écrire un commentaire...", "es": "Escribe un comentario..."},
+    "Damit wir dich bei Antworten benachrichtigen können (E-Mail oder Nummer erforderlich):": {"en": "So we can notify you of replies (email or phone required):", "fr": "Pour vous notifier des réponses (email ou numéro requis) :", "es": "Para notificarte de las respuestas (correo o número requerido):"},
+    "E-Mail-Adresse": {"en": "Email address", "fr": "Adresse e-mail", "es": "Dirección de correo"},
+    "Handynummer (für WhatsApp-Benachrichtigung)": {"en": "Phone number (for WhatsApp notification)", "fr": "Numéro (notification WhatsApp)", "es": "Número (notificación WhatsApp)"},
+    "Kommentar senden": {"en": "Send comment", "fr": "Envoyer", "es": "Enviar comentario"},
+    "Beitrags-ID:": {"en": "Post ID:", "fr": "ID publication :", "es": "ID publicación:"},
+}
+
+def __(text: str, lang: str) -> str:
+    """UI-String übersetzen. Fallback: Originaltext."""
+    if lang == "de" or not text:
+        return text
+    entry = UI_TEXT.get(text)
+    return entry.get(lang, text) if entry else text
+
+def _ui_text_json(lang: str) -> str:
+    """Erzeugt JSON-Objekt mit allen Übersetzungen für target_lang."""
+    result = {}
+    for de_text, trans in UI_TEXT.items():
+        result[de_text] = trans.get(lang, de_text)
+    return json.dumps(result, ensure_ascii=False)
+
 @app.route('/api/chat', methods=['POST'])
 def api_chat():
     """Chat agent with read-only access to published submissions."""
@@ -4849,7 +4916,7 @@ def public_detail(sub_id: int):
   </a>
 </header>
 <main class="detail-container">
-  <a href="/" class="back-link">← Zurück zur Übersicht</a>
+  <a href="/" class="back-link">← {__("Zurück zur Übersicht", lang)}</a>
   <article class="detail-card{(" has-banner" if row["category"] == "ausverkauft" else "")}">
     {"".join([f'<div class="detail-halle"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#fff" stroke-width="2.5" stroke-linecap="round" style="vertical-align:middle;margin-right:2px;"><path d="M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z"/><circle cx="12" cy="10" r="3"/></svg> {row["halle"]}</div>' if row["halle"] else '', f'<div class="detail-ausverkauft-banner"><span class="badge-icon">🚫</span> AUSVERKAUFT{("<span class=\"badge-title\"> · " + row["spiel_titel"] + "</span>") if row["spiel_titel"] else ""}</div>' if row["category"] == "ausverkauft" else ''])}
     <div class="detail-meta">
@@ -4860,31 +4927,31 @@ def public_detail(sub_id: int):
     <div class="detail-media">{media_html}</div>
     {"".join([f'<div class="detail-content">{content}</div>' if content else ''])}
     <div style="display:flex;align-items:center;gap:1rem;margin-top:1.5rem;padding-top:1rem;border-top:1px solid #f0ede6;">
-      <span style="font-size:0.8rem;color:#999;"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#999" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:2px;"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"/><circle cx="12" cy="12" r="3"/></svg> {row['views'] or 0} Aufrufe</span>
+      <span style="font-size:0.8rem;color:#999;"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#999" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:2px;"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"/><circle cx="12" cy="12" r="3"/></svg> {row['views'] or 0} {__("Aufrufe", lang)}</span>
       <button id="detail-like-btn" data-id="{sub_id}" class="detail-like-btn"><svg width="16" height="16" viewBox="0 0 24 24" fill="#EF4444" stroke="#EF4444" stroke-width="0.5" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:middle;margin-right:2px;"><path d="M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z"/></svg> {row['likes'] or 0}</button>
     </div>
   </article>
   <section class="comments-section">
-    <h3 class="comments-heading">💬 Kommentare ({len(comment_rows)})</h3>
+    <h3 class="comments-heading">💬 {__("Kommentare", lang)} ({len(comment_rows)})</h3>
     {comments_html}
     <form id="commentForm" class="comment-form" onsubmit="return submitComment(event, {sub_id})">
       <div id="replyInfo" class="reply-info">↩ Antwort an <span id="replyTarget"></span> <a href="#" onclick="cancelReply()" style="color:#c62828;font-size:0.7rem;">× abbrechen</a></div>
       <input type="hidden" name="parent_id" id="commentParentId" value="">
-      <input type="text" name="author" placeholder="Dein Name (optional)" maxlength="80" class="comment-input">
-      <textarea name="content" placeholder="Schreib einen Kommentar..." maxlength="2000" required class="comment-textarea"></textarea>
-      <div class="comment-field-hint"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#20228a" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:4px;"><path d="M18 8A6 6 0 0 0 6 8c0 7-3 9-3 9h18s-3-2-3-9"/><path d="M13.73 21a2 2 0 0 1-3.46 0"/></svg> Damit wir dich bei Antworten benachrichtigen können (E-Mail oder Nummer erforderlich):</div>
-      <input type="email" name="email" placeholder="E-Mail-Adresse" maxlength="200" class="comment-email">
-      <input type="tel" name="phone" placeholder="Handynummer (für WhatsApp-Benachrichtigung)" maxlength="50" class="comment-phone">
-      <button type="submit" class="comment-submit-btn">Kommentar senden</button>
+      <input type="text" name="author" placeholder="{__("Dein Name (optional)", lang)}" maxlength="80" class="comment-input">
+      <textarea name="content" placeholder="{__("Schreib einen Kommentar...", lang)}" maxlength="2000" required class="comment-textarea"></textarea>
+      <div class="comment-field-hint"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#20228a" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:4px;"><path d="M18 8A6 6 0 0 0 6 8c0 7-3 9-3 9h18s-3-2-3-9"/><path d="M13.73 21a2 2 0 0 1-3.46 0"/></svg> {__("Damit wir dich bei Antworten benachrichtigen können (E-Mail oder Nummer erforderlich):", lang)}</div>
+      <input type="email" name="email" placeholder="{__("E-Mail-Adresse", lang)}" maxlength="200" class="comment-email">
+      <input type="tel" name="phone" placeholder="{__("Handynummer (für WhatsApp-Benachrichtigung)", lang)}" maxlength="50" class="comment-phone">
+      <button type="submit" class="comment-submit-btn">{__("Kommentar senden", lang)}</button>
     </form>
     <div id="commentStatus" style="display:none;margin-top:0.5rem;padding:0.5rem;border-radius:8px;font-size:0.85rem;"></div>
   </section>
 </main>
 <footer class="site-footer">
-  <p>Powered by <a href="https://brettspiel-news.de">brettspiel-news.de</a></p>
+  <p>{__("Powered by", lang)} <a href="https://brettspiel-news.de">brettspiel-news.de</a></p>
 </footer>
 <div style="text-align:center;padding:1rem 1.5rem 2.5rem;font-size:0.7rem;color:#aaa;max-width:720px;margin:0 auto;">
-  Beitrags-ID: <strong style="color:#20228a;">#{sub_id}</strong> \u2014 Bei Fragen oder Löschwunsch bitte diese ID angeben.
+  {__("Beitrags-ID:", lang)} <strong style="color:#20228a;">#{sub_id}</strong> \u2014 Bei Fragen oder Löschwunsch bitte diese ID angeben.
 </div>
 <script>
 (function(){{
diff --git a/src/app.py b/src/app.py
index 159274c..5eaf683 100644
--- a/src/app.py
+++ b/src/app.py
@@ -4169,10 +4169,77 @@ def _lang_dropdown_html(lang: str) -> str:
       });
     });
   }
+})();
+  // UI text translation
+  var lang = localStorage.getItem("bsn-lang") || "de";
+  if (lang !== "de") {
+    var uiText =  + '_ui_text_json(lang)' + ;
+    function translateUI() {
+      // Translate text content of elements with specific text
+      var walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT);
+      var node;
+      while (node = walker.nextNode()) {
+        var txt = node.textContent.trim();
+        if (uiText[txt]) {
+          node.textContent = node.textContent.replace(txt, uiText[txt]);
+        }
+      }
+      // Translate input placeholders
+      document.querySelectorAll("[placeholder]").forEach(function(el) {
+        var ph = el.getAttribute("placeholder");
+        if (uiText[ph]) el.setAttribute("placeholder", uiText[ph]);
+      });
+      // Translate button text
+      document.querySelectorAll("button").forEach(function(el) {
+        if (el.textContent.trim() && uiText[el.textContent.trim()]) {
+          el.textContent = uiText[el.textContent.trim()];
+        }
+      });
+    }
+    if (document.readyState === "loading") {
+      document.addEventListener("DOMContentLoaded", translateUI);
+    } else {
+      translateUI();
+    }
+  }
 })();
 </script>"""
 
 
+# ═══════════════════════════════════════════
+# UI-Text-Übersetzungen (via JS + Fallback)
+# ═══════════════════════════════════════════
+UI_TEXT = {
+    "Willkommen in der BSN Community!": {"en": "Welcome to the BSN Community!", "fr": "Bienvenue dans la communauté BSN !", "es": "¡Bienvenido a la comunidad BSN!"},
+    "Nicht mehr anzeigen": {"en": "Don't show again", "fr": "Ne plus afficher", "es": "No mostrar más"},
+    "Alles klar!": {"en": "Got it!", "fr": "Compris !", "es": "¡Entendido!"},
+    "Powered by": {"en": "Powered by", "fr": "Propulsé par", "es": "Desarrollado por"},
+    "Zurück zur Übersicht": {"en": "Back to overview", "fr": "Retour à l'aperçu", "es": "Volver a la vista general"},
+    "Aufrufe": {"en": "views", "fr": "vues", "es": "vistas"},
+    "Kommentare": {"en": "Comments", "fr": "Commentaires", "es": "Comentarios"},
+    "Dein Name (optional)": {"en": "Your name (optional)", "fr": "Votre nom (facultatif)", "es": "Tu nombre (opcional)"},
+    "Schreib einen Kommentar...": {"en": "Write a comment...", "fr": "Écrire un commentaire...", "es": "Escribe un comentario..."},
+    "Damit wir dich bei Antworten benachrichtigen können (E-Mail oder Nummer erforderlich):": {"en": "So we can notify you of replies (email or phone required):", "fr": "Pour vous notifier des réponses (email ou numéro requis) :", "es": "Para notificarte de las respuestas (correo o número requerido):"},
+    "E-Mail-Adresse": {"en": "Email address", "fr": "Adresse e-mail", "es": "Dirección de correo"},
+    "Handynummer (für WhatsApp-Benachrichtigung)": {"en": "Phone number (for WhatsApp notification)", "fr": "Numéro (notification WhatsApp)", "es": "Número (notificación WhatsApp)"},
+    "Kommentar senden": {"en": "Send comment", "fr": "Envoyer", "es": "Enviar comentario"},
+    "Beitrags-ID:": {"en": "Post ID:", "fr": "ID publication :", "es": "ID publicación:"},
+}
+
+def __(text: str, lang: str) -> str:
+    """UI-String übersetzen. Fallback: Originaltext."""
+    if lang == "de" or not text:
+        return text
+    entry = UI_TEXT.get(text)
+    return entry.get(lang, text) if entry else text
+
+def _ui_text_json(lang: str) -> str:
+    """Erzeugt JSON-Objekt mit allen Übersetzungen für target_lang."""
+    result = {}
+    for de_text, trans in UI_TEXT.items():
+        result[de_text] = trans.get(lang, de_text)
+    return json.dumps(result, ensure_ascii=False)
+
 @app.route('/api/chat', methods=['POST'])
 def api_chat():
     """Chat agent with read-only access to published submissions."""
@@ -4849,7 +4916,7 @@ def public_detail(sub_id: int):
   </a>
 </header>
 <main class="detail-container">
-  <a href="/" class="back-link">← Zurück zur Übersicht</a>
+  <a href="/" class="back-link">← {__("Zurück zur Übersicht", lang)}</a>
   <article class="detail-card{(" has-banner" if row["category"] == "ausverkauft" else "")}">
     {"".join([f'<div class="detail-halle"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#fff" stroke-width="2.5" stroke-linecap="round" style="vertical-align:middle;margin-right:2px;"><path d="M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z"/><circle cx="12" cy="10" r="3"/></svg> {row["halle"]}</div>' if row["halle"] else '', f'<div class="detail-ausverkauft-banner"><span class="badge-icon">🚫</span> AUSVERKAUFT{("<span class=\"badge-title\"> · " + row["spiel_titel"] + "</span>") if row["spiel_titel"] else ""}</div>' if row["category"] == "ausverkauft" else ''])}
     <div class="detail-meta">
@@ -4860,31 +4927,31 @@ def public_detail(sub_id: int):
     <div class="detail-media">{media_html}</div>
     {"".join([f'<div class="detail-content">{content}</div>' if content else ''])}
     <div style="display:flex;align-items:center;gap:1rem;margin-top:1.5rem;padding-top:1rem;border-top:1px solid #f0ede6;">
-      <span style="font-size:0.8rem;color:#999;"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#999" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:2px;"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"/><circle cx="12" cy="12" r="3"/></svg> {row['views'] or 0} Aufrufe</span>
+      <span style="font-size:0.8rem;color:#999;"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#999" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:2px;"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"/><circle cx="12" cy="12" r="3"/></svg> {row['views'] or 0} {__("Aufrufe", lang)}</span>
       <button id="detail-like-btn" data-id="{sub_id}" class="detail-like-btn"><svg width="16" height="16" viewBox="0 0 24 24" fill="#EF4444" stroke="#EF4444" stroke-width="0.5" stroke-linecap="round" stroke-linejoin="round" style="vertical-align:middle;margin-right:2px;"><path d="M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z"/></svg> {row['likes'] or 0}</button>
     </div>
   </article>
   <section class="comments-section">
-    <h3 class="comments-heading">💬 Kommentare ({len(comment_rows)})</h3>
+    <h3 class="comments-heading">💬 {__("Kommentare", lang)} ({len(comment_rows)})</h3>
     {comments_html}
     <form id="commentForm" class="comment-form" onsubmit="return submitComment(event, {sub_id})">
       <div id="replyInfo" class="reply-info">↩ Antwort an <span id="replyTarget"></span> <a href="#" onclick="cancelReply()" style="color:#c62828;font-size:0.7rem;">× abbrechen</a></div>
       <input type="hidden" name="parent_id" id="commentParentId" value="">
-      <input type="text" name="author" placeholder="Dein Name (optional)" maxlength="80" class="comment-input">
-      <textarea name="content" placeholder="Schreib einen Kommentar..." maxlength="2000" required class="comment-textarea"></textarea>
-      <div class="comment-field-hint"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#20228a" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:4px;"><path d="M18 8A6 6 0 0 0 6 8c0 7-3 9-3 9h18s-3-2-3-9"/><path d="M13.73 21a2 2 0 0 1-3.46 0"/></svg> Damit wir dich bei Antworten benachrichtigen können (E-Mail oder Nummer erforderlich):</div>
-      <input type="email" name="email" placeholder="E-Mail-Adresse" maxlength="200" class="comment-email">
-      <input type="tel" name="phone" placeholder="Handynummer (für WhatsApp-Benachrichtigung)" maxlength="50" class="comment-phone">
-      <button type="submit" class="comment-submit-btn">Kommentar senden</button>
+      <input type="text" name="author" placeholder="{__("Dein Name (optional)", lang)}" maxlength="80" class="comment-input">
+      <textarea name="content" placeholder="{__("Schreib einen Kommentar...", lang)}" maxlength="2000" required class="comment-textarea"></textarea>
+      <div class="comment-field-hint"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#20228a" stroke-width="2" stroke-linecap="round" style="vertical-align:middle;margin-right:4px;"><path d="M18 8A6 6 0 0 0 6 8c0 7-3 9-3 9h18s-3-2-3-9"/><path d="M13.73 21a2 2 0 0 1-3.46 0"/></svg> {__("Damit wir dich bei Antworten benachrichtigen können (E-Mail oder Nummer erforderlich):", lang)}</div>
+      <input type="email" name="email" placeholder="{__("E-Mail-Adresse", lang)}" maxlength="200" class="comment-email">
+      <input type="tel" name="phone" placeholder="{__("Handynummer (für WhatsApp-Benachrichtigung)", lang)}" maxlength="50" class="comment-phone">
+      <button type="submit" class="comment-submit-btn">{__("Kommentar senden", lang)}</button>
     </form>
     <div id="commentStatus" style="display:none;margin-top:0.5rem;padding:0.5rem;border-radius:8px;font-size:0.85rem;"></div>
   </section>
 </main>
 <footer class="site-footer">
-  <p>Powered by <a href="https://brettspiel-news.de">brettspiel-news.de</a></p>
+  <p>{__("Powered by", lang)} <a href="https://brettspiel-news.de">brettspiel-news.de</a></p>
 </footer>
 <div style="text-align:center;padding:1rem 1.5rem 2.5rem;font-size:0.7rem;color:#aaa;max-width:720px;margin:0 auto;">
-  Beitrags-ID: <strong style="color:#20228a;">#{sub_id}</strong> \u2014 Bei Fragen oder Löschwunsch bitte diese ID angeben.
+  {__("Beitrags-ID:", lang)} <strong style="color:#20228a;">#{sub_id}</strong> \u2014 Bei Fragen oder Löschwunsch bitte diese ID angeben.
 </div>
 <script>
 (function(){{