feat(i18n): add RTL language detection note to localization files and update HTML

src/pages/txt-to-pdf.html

@@ -324,8 +324,10 @@
 
         <p class="text-xs text-gray-500 mt-3">
           <i data-lucide="info" class="inline w-3 h-3"></i>
-          RTL languages (Arabic, Urdu, Persian, etc.) are automatically detected
-          and text direction is adjusted.
+          <span data-i18n="tools:textToPdf.rtlAutoDetectNote"
+            >RTL languages (Arabic, Urdu, Persian, etc.) are automatically
+            detected and text direction is adjusted.</span
+          >
         </p>
 
         <button