fix: correct locale path in translation guide, add missing link attributes in footer, fix wasm version in readme

- TRANSLATION.md: Spanish example incorrectly referenced fr/ locale path instead of es/

- footer.html: Instagram and LinkedIn links were missing target=_blank and rel=noopener noreferrer, unlike the other social links

- README.md: air-gapped manual steps referenced pymupdf-wasm@0.11.14 but the current default is 0.11.16

src/partials/footer.html

@@ -135,6 +135,8 @@
           </a>
           <a
             href="https://www.instagram.com/thebentopdf/"
+            target="_blank"
+            rel="noopener noreferrer"
             class="text-gray-400 hover:text-indigo-400"
             title="Instagram"
           >
@@ -142,6 +144,8 @@
           </a>
           <a
             href="https://www.linkedin.com/company/bentopdf/"
+            target="_blank"
+            rel="noopener noreferrer"
             class="text-gray-400 hover:text-indigo-400"
             title="LinkedIn"
           >