Zimbabwe: replace 'Mzalendo' or 'Mzalendo Zimbabwe' with 'Kuvakazim'
Zimbabwe: update with logo and colours from Peter Teuben

These changes are just to make the logo and colours match
the Kuvakazim site here: http://carma.astro.umd.edu/ztest/

The logo was provided by Peter Teuben.
Merge branch 'zimbabwe'