[Bug]PortalPageLabels can't handle non-ascii labelname

[roy huang]

Hi all:
    With help of wiki http://wiki.apache.org/cocoon/PortalPageLabels, I change 
portal using label.It works fine until I use non-ASCII labelname ,the url 
generate by portal can't recognize by portal.
    For example:
    If label name is:公告栏（Simplified Chinese），url 
is:portal-page?pageLabel=%B9%AB%B8%E6%C0%B8,it won't work
    Because I'm using utf-8 encoding ,so I change url to 
portal-page?pageLabel=%E5%85%AC%E5%91%8A%E6%A0%8F,it works
    
    So the bug is obviously caused by url encoding.

    WDYT?

Roy Huang