refactor(i18n): centralize unknownError and unify pdfToText note keys

src/pages/pdf-to-text.html

@@ -131,17 +131,10 @@
         >
           <p class="text-amber-200 text-sm">
             <strong data-i18n="tools:pdfToText.noteLabel">Note:</strong>
-            <span data-i18n="tools:pdfToText.notePrefix"
+            <span data-i18n="tools:pdfToText.noteText"
               >This tool works ONLY with digitally created PDFs. For scanned
-              documents or image-based PDFs, use our</span
+              documents or image-based PDFs, use our OCR PDF tool instead.</span
             >
-            <a
-              href="ocr-pdf.html"
-              class="text-indigo-400 hover:text-indigo-300 underline"
-              data-i18n="tools:ocrPdf.name"
-              >OCR PDF tool</a
-            >
-            <span data-i18n="tools:pdfToText.noteSuffix">instead.</span>
           </p>
         </div>