Implements default language config property and comments to config.js

config.js

     enableWelcomePage: true,
     enableSimulcast: false, // blocks FF support
     logStats: false, // Enable logging of PeerConnection stats via the focus
+//    startAudioMuted: 10, //every participant after the Nth will start audio muted
+//    startVideoMuted: 10, //every participant after the Nth will start video muted
+//    defaultLanguage: "en",
     /*noticeMessage: 'Service update is scheduled for 16th March 2015. ' +
     'During that time service will not be available. ' +
     'Apologise for inconvenience.'*/

index.html

     <meta itemprop="description" content="Join a WebRTC video conference powered by the Jitsi Videobridge"/>
     <meta itemprop="image" content="/images/jitsilogo.png"/>
     <script src="libs/jquery-2.1.1.min.js"></script>
-    <script src="config.js?v=8"></script><!-- adapt to your needs, i.e. set hosts and bosh path -->
+    <script src="config.js?v=9"></script><!-- adapt to your needs, i.e. set hosts and bosh path -->
     <script src="libs/strophe/strophe.min.js?v=1"></script>
     <script src="libs/strophe/strophe.disco.min.js?v=1"></script>
     <script src="libs/strophe/strophe.caps.jsonly.min.js?v=1"></script>
     <script src="libs/popover.js?v=1"></script><!-- bootstrap tooltip lib -->
     <script src="libs/toastr.js?v=1"></script><!-- notifications lib -->
     <script src="interface_config.js?v=5"></script>
-    <script src="libs/app.bundle.js?v=78"></script>
+    <script src="libs/app.bundle.js?v=79"></script>
     <script src="analytics.js?v=1"></script><!-- google analytics plugin -->
     <link rel="stylesheet" href="css/font.css?v=7"/>
     <link rel="stylesheet" href="css/toastr.css?v=1">

libs/app.bundle.js

                 var settings = Settings.getSettings();
                 if(settings)
                     lang = settings.language;
+
+                if(!lang && config.defaultLanguage)
+                {
+                    lang = config.defaultLanguage;
+                }
             }
         }
 

modules/translation/translation.js

                 var settings = Settings.getSettings();
                 if(settings)
                     lang = settings.language;
+
+                if(!lang && config.defaultLanguage)
+                {
+                    lang = config.defaultLanguage;
+                }
             }
         }