Adds a missing resource property. Patch contributed by Tom Denham.

resources/languages/resources.properties

@@ -329,6 +329,7 @@ service.gui.NEW_STATUS_MESSAGE=New status message
 service.gui.NO=No
 service.gui.NONE=None
 service.gui.NO_CAMERA_AVAILABLE=No camera available
+service.gui.NO_DESKTOP_SHARING_FOR_PROTOCOL=Desktop sharing is not supported for this protocol
 service.gui.NO_VIDEO_ENCODINGS=No video encodings are selected in configuration
 service.gui.NO_VIDEO_FOR_PROTOCOL=Video is not supported for this protocol
 service.gui.NO_AVAILABLE_ROOMS=The list of rooms for this server is currently not available.

src/net/java/sip/communicator/impl/gui/main/call/DesktopSharingButton.java

@@ -64,11 +64,12 @@ public DesktopSharingButton(Call call, boolean fullScreen, boolean selected)
         OperationSetDesktopSharingServer desktopSharing
                 = call.getProtocolProvider().getOperationSet(
                 OperationSetDesktopSharingServer.class);
+        System.err.println("DOHH"+desktopSharing);
 
         if (desktopSharing == null)
         {
-            setToolTipText(GuiActivator.getResources()
-                    .getI18NString("NO_DESKTOP_SHARING_FOR_PROTOCOL"));
+            setToolTipText(GuiActivator.getResources().getI18NString(
+                    "service.gui.NO_DESKTOP_SHARING_FOR_PROTOCOL"));
             desktopSharingAvailable = false;
         }
         else if(!ConfigurationManager.hasEnabledVideoFormat(