Update admin.html

Additional European and Cyrillic characters

templates/admin.html

@@ -416,7 +416,7 @@
             let cleanedText = textInput.replace(/ \- | \– /g, ' '); // Replace hyphens
             cleanedText = cleanedText.replace(/%/g, " percent");
             //cleanedText = cleanedText.replace(/([!?.])\1+/g, '$1');
-            cleanedText = cleanedText.replace(/[^a-zA-Z0-9\s\.,;:!?\-\'"]/g, '');
+            cleanedText = cleanedText.replace(/[^a-zA-Z0-9\s\.,;:!?\-\'"À-ÿ\u0400-\u04FF]/g, '');
             cleanedText = cleanedText.replace(/\n+/g, ' ');
             cleanedText = cleanedText.replace(/\.\s'/g, ".'"); // Remove space between period and single quote
             //cleanedText = cleanedText.replace(/'/g, ""); // Remove all single quotes
@@ -1431,4 +1431,4 @@
 
 </body>
 
-</html>
+</html>