Fixes #35 - Progressively enhance install button with appropriate links and text

static/js/index.js

 "use strict";
 
 (function()
 {
   var supportedPlatforms = {
 
     // Desktop browsers
     "chrome": "https://chrome.google.com/webstore/detail/cfhdojbkjhnklbpkdaibdccddilifddb",
     "opera": "https://addons.opera.com/extensions/details/opera-adblock/?display=en-US",
     "yandexbrowser": "https://chrome.google.com/webstore/detail/cfhdojbkjhnklbpkdaibdccddilifddb",
@@ skipping 14 matching lines @@
       .find(bowser.hasOwnProperty.bind(bowser));
 
     if (!detectedPlatform) return;
 
     document.body.classList.add(detectedPlatform);
 
     if (detectedPlatform == "maxthon") return;
 
     var heroDownloadButton = document.getElementById("hero-download-button");
     heroDownloadButton.href = supportedPlatforms[detectedPlatform];
-    heroDownloadButton.innerHTML = document

[juliandoucette, 2018/04/16 15:44:41]

NIT/Suggest: innerText (we don't support IE 8 anymore and it's ~more secure?)

[ire, 2018/04/16 16:00:59]

Changed to textContent which seems to be better for performance 

(https://developer.mozilla.org/en-US/docs/Web/API/Node/textContent,
https://developer.mozilla.org/en-US/docs/Web/API/Node/textContent)

[juliandoucette, 2018/04/16 16:12:58]

Thanks!

(Facepalm: I meant to say textContent. My unconsciously wrote the last thing I
read by mistake.)

-      .getElementById("hero-download-button-template-" + detectedPlatform)
-      .innerHTML;
+    heroDownloadButton.textContent = document
+      .getElementById("download-label-" + detectedPlatform)
+      .textContent;
     
     heroDownloadButton.addEventListener("click", function(event)
     {
       if (typeof chrome == "undefined") return;
       event.preventDefault();
 
       try

[juliandoucette, 2018/04/16 15:44:41]

TOL: Why are curly braces required for try/catch statements :/?

[ire, 2018/04/16 16:00:59]

I know right?!?! Maybe there's a good reason I don't know about

       {
         chrome.webstore.install();
       }
       catch(error)
       {
         window.location = "/" + this.hreflang + "/download";
       }
     });
   }
 
   if (typeof bowser != "undefined") setupHeroDownloadButton();
 
 }());