Add Events link to the header on translate.w.org

[trymebytes]

We need to add a link to the header on translate.wordpress.org, see mockup below;

[amieiro]

Is this menu hard-coded in a plugin, or is it in a menu, so we can add an item using the UI?

[trymebytes]

It doesn't appear to be hardcoded, looks like it's in a menu added in the admin backend.

[psrpinto]

Closing in favour of #109.