Hi,
Have a look at my wikis where I changed "Recent changes" to "What's New": http://nerdypc.wikinerds.org or http://jnana.wikinerds.org
I suppose that Wikipedia should do the same because most web surfers are familiar with the "What's New" link but they may not clearly understand what "Recent changes" is about.
Also, I think that the "Community portal" link could be just "Community". Shorter, simpler and less clutter.