Added tweet translation mechanism (#96)

* Added tweet translation mechanism.

* Removed test translation.

It was done via Google Translate which I don't trust for this application.

js/_fixer.js

@@ -0,0 +1,15 @@
+function fixTweetMentions() {
+       document.querySelectorAll('div.tweet-text> p').forEach((p) => {
+               for (const node of p.childNodes) {
+                       if (node.nodeType == Node.ELEMENT_NODE && node.tagName == "A" && node.classList.contains("mention")) {
+                               node.classList.add("initial-mention");
+                       } else if (node.nodeType == Node.TEXT_NODE && node.textContent.trim() == '') {
+                               // nothing to do
+                       } else {
+                               // we got to the main text of the tweet and must stop
+                               return;
+                       }
+               }
+       });
+   };
+document.addEventListener('DOMContentLoaded', fixTweetMentions, false);