Create a url to change language on Portal

You can use following code to change the language on Portal.

<portal-navigation:url command="ChangeLanguage">
  <portal-navigation:urlParam name="locale" value="<language>"/>
</portal-navigation:url>

There was a problem with this when navigational state is cleared. 

This happens if  bookmarks to friendly URLs are used for navigation or 

the navigational state is cleared intentionally.

You can this technique to store language value in cookie temporarily and 
It sets the locale information, if no locale information can be 

found in the navigational state.

Configure cookie support language using this 

url: http://www-01.ibm.com/support/docview.wss?uid=swg1PM17679