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How I can add some Google font?

You can add any Google font here: ../fw/core/core.lists.php, lines 1232-1302 (section: Return Google fonts list).

E.g. add new string like this: 

$list['Merriweather'] = array('family'=>'serif');

where Merriweather is name of the needed Google font.

LIke here: http://screencast.com/t/aIMZvp3Cc