Culture squad is no longer an active space. Wheras Earth OS is. Are instructions for how to make changes in that menu in a wiki @matthias?
No instructions in a manual for this, sorry. But I made the changes you proposed. 
(For reference, changes can be made by editing some CSS and HTML here, in the “CSS” and “” tabs. CSS changes are visible immediately without even reloading, while HTML changes need a page reload.)
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