beginning of 2.2 (one more fix)

- added download popup to solve the issue with downloads on ios
- merged big and small popups into one
- made buttons in donation menu act like buttons
- began to clean up localisation
- added ability to embed repo url into localisation strings
- moved ffmpeg args to config for more flexibility (and hopefully future changes)
- removed error response in stream that could result in a crash
- removed notice for ios users from about cause it's no longer relevant
- made error popup look and act like the rest
- a tiny bit of clean up
- changelog is now made out of latest commit (and doesn't break)

modules/page-renderer.js

@@ -91,7 +91,7 @@ export default function(obj) {
             </div>
             <div id="content" class="popup-content">
                 <div id="desc" class="popup-desc about-padding">${com[1]}</div>
-                <div id="desc" class="popup-desc"><a class="text-backdrop" href="${repo}/commits">${loc(obj.lang, 'changelog', 'github')}</a></div>
+                <div id="desc" class="popup-desc"><a class="text-backdrop" href="${repo}/commits">${loc(obj.lang, 'desc', 'github')}</a></div>
             </div>
         </div>
         <div id="popup-donate" class="popup scrollable center box" style="visibility: hidden;">