<apex:page id="thepage" controller="PageController1" language="{!IF(ISNULL(language),'en_US',language)}">
    <apex:form id="theform">
            <apex:commandlink action="{!changeEnglish}" rerender="thepage" value="English"/><br/>
<br/><br/>
        <apex:commandlink action="{!changeFrench}" rerender="thepage" value="French"/><br/><br/><br/>



        <apex:outputLabel value="{!$Label.french}" rendered="true" onclick="changeEnglish();"/><br/>
        <apex:outputLabel value="{!$Label.english}" rendered="true" onclick="changeFrench();"/><br/><br/><br/><br/>
        Text of page here
    </apex:form>
</apex:page>