Add some comments on the various labels

src/js/client.js

@@ -1389,7 +1389,7 @@ angular.module('Application').service('Client', ['$http', '$interval', 'md5', 'N
         // extract progress percentage
         var installationProgress = app.installationProgress || '';
         var progress = parseInt(installationProgress.split(',')[0], 10);
-        // Unfortunatelly some errors are not actual progress messages, but still have a number in fron like a http status code
+        // Unfortunately some errors are not actual progress messages, but still have a number in fron like a http status code
         if (isNaN(progress) || progress > 100) {
             app.progress = 0;
             app.message = installationProgress;