diff --git a/serp.py b/serp.py
index 96560d2..1459146 100644
--- a/serp.py
+++ b/serp.py
@@ -368,12 +368,17 @@ function setLang(code) {
 }
 '''
     html = html.replace('<script>', f'<script>\nconst T={json.dumps(trans)};\n{lang_js}', 1)
-    # Insert language selector before </div> in nav (after About link)
-    html = html.replace('<a href="/about">{{about}}</a>\n    </div>',
-                        f'<a href="/about">{{{{about}}}}</a>\n        {lang_selector}\n    </div>')
-    # Replace all {{key}} placeholders (double braces for static text)
+    # Insert language selector in nav (handle both {{about}} and {about} from f-strings)
+    for pattern in ['{{about}}</a>\n    </div>', '{about}</a>\n    </div>',
+                    '{{about}}</a>\n        </div>', '{about}</a>\n        </div>']:
+        if pattern in html:
+            html = html.replace(f'<a href="/about">{pattern}',
+                               f'<a href="/about">{pattern.split("</a>")[0]}</a>\n        {lang_selector}\n    </div>')
+            break
+    # Replace all {key} and {{key}} placeholders
     for key, value in trans.items():
-        html = html.replace('{{' + key + '}}', value)
+        html = html.replace('{{' + key + '}}', value)  # Double braces (static templates)
+        html = html.replace('{' + key + '}', value)    # Single braces (after f-string)
     return html
 
 app = FastAPI(title="neopig", description="Media crawler + SERP + Screenshot service")