More helpful message if already running

Why: The current message assumes the balloon to appear attached
to the icon which is not the case in Windows 10.

Based on feedback from larson0815 and Deantwo here:
https://github.com/selvanair/openvpn-gui/issues/5

Signed-off-by: Selva Nair <selva.nair@gmail.com>

res/openvpn-gui-res-en.rc

@@ -462,6 +462,6 @@ BEGIN
     IDS_ERR_INVALID_PASSWORD_INPUT "Invalid character in password"
     IDS_ERR_INVALID_USERNAME_INPUT "Invalid character in username"
     IDS_NFO_AUTO_CONNECT    "Connecting automatically in %u seconds..."
-    IDS_NFO_CLICK_HERE_TO_START "Right click here to start"
+    IDS_NFO_CLICK_HERE_TO_START "OpenVPN GUI is already running. Right click on the tray icon to start."
 
 END