updated proxy auth preferences

app/view/preferences/Preferences.js

@@ -276,18 +276,22 @@ Ext.define('Rambox.view.preferences.Preferences',{
 								,name: 'proxyPort'
 								,value: config.proxyPort
 								,margin: '0 0 0 10'
-							},{
+							}
+							,{
 								xtype: 'textfield'
 							   ,fieldLabel: 'Login'
 							   ,name: 'proxyLogin'
 							   ,value: config.proxyLogin
 							   ,margin: '0 0 0 10'
-						   },{
+							   ,emptyText: 'optional'
+							}
+							,{
 								xtype: 'textfield'
 								,fieldLabel: 'Password'
 								,name: 'proxyPassword'
 								,value: config.proxyPassword
 								,margin: '0 0 0 10'
+								,emptyText: 'optional'
 							}
 						]
 					}