add blurb about Source Zips and Stand-alone BrowserSim Zip
Make blurp not mention browsersim, just mention updatesite zip install instructions
fix descriptive text for artifacts (not artefacts) page
Add link to cat mailing list announcing CR2 for testing

Fix for unknow type of downloads (xcoulon)
Fixed "Unknown" download label

Replaced with "Download" when the file type is unknown (eg: link to an artifact on Nexus)
JBIDE-18509 - Missing icon for Google Plus in Follow Us submenu