Removes an unnecessary message and changes the video bridge message.

app.js

@@ -840,7 +840,7 @@ $(document).bind('presence.muc', function (event, jid, info, pres) {
     if($(pres).find(">bridgeIsDown").length > 0 && !bridgeIsDown) {
         bridgeIsDown = true;
         messageHandler.showError("Error",
-            "The video bridge is currently unavailable.");
+            "Jitsi Videobridge is currently unavailable. Please try again later!");
     }
 
 });

desktopsharing.js

@@ -240,7 +240,6 @@ function initInlineInstalls()
 
 function getSwitchStreamFailed(error) {
     console.error("Failed to obtain the stream to switch to", error);
-    messageHandler.showError('Error', 'Failed to get video stream');
     switchInProgress = false;
 }