Issue 4027 - make the download button available for windows insider users

includes/index.tmpl

Index: includes/index.tmpl
===================================================================
--- a/includes/index.tmpl
+++ b/includes/index.tmpl
@@ -69,7 +69,7 @@
     </div>
 
     <h3 class="edge-message">
-      {{"Please check back later for a version of Adblock Plus for Microsoft Edge."|translate("edge-message")}}
+      {{"Adblock Plus is ​<a href='https://www.microsoft.com/store/apps/adblock-plus/9nblggh4r9nz' target='_blank'>available</a> for Windows Insiders on a build 14342 or higher."|translate("edge-message")}}

[saroyanm, 2016/05/13 10:50:20]

@Ollie can you please help me updating the message, the initial one you have
provided was big so it was overlapping the bullet points for some translations,
so will really appreciate if you can help me with finding better wording, or let
me know if you are Okey with current one, alternatively I can make font smaller
but the message will not be that eye catchy.

[Sebastian Noack, 2016/05/17 08:50:13]

I don't think we should link to the Windows Store here, as Adblock Plus won't
work for users seeing this message anyway. In fact, if they click the link they
might still be able to install it, but it won't work.

Also I think it should be "on build 14342" instead of "on a build 14342".

[saroyanm, 2016/05/17 12:38:53]

Done.

     </h3>
 
     <div id="install">
@@ -80,6 +80,7 @@
       <a class="install-button" href="https://update.adblockplus.org/latest/adblockplusie.exe" id="install-internet-explorer">{{"Install for Internet Explorer"|translate("s17")}}</a>
       <a class="install-button" href="https://update.adblockplus.org/latest/adblockplussafari.safariextz" id="install-safari">{{"Install for Safari"|translate("s18")}}</a>
       <a class="install-button" href="https://chrome.google.com/webstore/detail/cfhdojbkjhnklbpkdaibdccddilifddb" id="install-yandex-browser" onclick="chrome.webstore.install(); return false;">{{"Install for Yandex Browser"|translate("s19")}}</a>
+      <a class="install-button" href="ms-windows-store://pdp/?ProductId=9nblggh4r9nz" id="install-edge">{{"Install for Microsoft Edge"|translate("install-edge")}}</a>
     </div>
 
     <div id="other-platform">