Changing Locale link behave one step behind

I'm using JSF 2 to create a web app with internationalization, with a switch link between English and French. When the page is in English, the page will have a French link; when the page is in French, it will have a English link. But when the page language gets switched, the link is not refreshed, till I refresh the page.

I looked at some posts saying, to implements PhaseListener, but it need import javax.el.ValueExpression; which is from servlet-api.jar. If I include this jar in my lib folder, I will get error 'java.lang.IllegalStateException: Application was not properly initialized at startup, could not find Factory: javax.faces.application.ApplicationFactory'

I googled this error, it says its caused by the conflict. Tomcat has already had this jar, I then checked server lib folder, it is there, but how could my Java class reference to there?? If I remove jsp-api.jar from my own lib directory, it's a compilation error, if I ignore it and still build war file and deploy it, its still failed to start the application as error now is 'INFO: validateJarFile(/usr/local/apache-tomcat-6.0.26/webapps/my_project/WEB-INF/lib/servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class

Please help, thanks.