GUAC-963: Add support for file transfer errors.

guacamole/src/main/webapp/app/client/templates/guacFileTransfer.html

@@ -1,4 +1,4 @@
-<div class="transfer" ng-class="{'in-progress': isInProgress(), 'savable': isSavable()}" ng-click="save()">
+<div class="transfer" ng-class="{'in-progress': isInProgress(), 'savable': isSavable(), 'error': hasError()}" ng-click="save()">
     <!--
        Copyright (C) 2014 Glyptodon LLC
 
@@ -30,4 +30,7 @@
     <!-- Progress bar -->
     <div class="progress"><div ng-style="{'width': getPercentDone() + '%'}" class="bar"></div></div>
 
+    <!-- Error text -->
+    <p class="error-text" ng-show="hasError()">{{getErrorText() | translate}}</p>
+    
 </div>