Artisteer & googlefonts

Here is my test-project in german language: link

It is supposed to become a homepage for an artist.

The theme was done with the newest Artisteer (the cheaper version without joomla…). The google fonts where integrated right there, not with a wp plugin (in the style.css). I found the following line in the functions.php:

wp_register_style("css", 'https://fonts.googleapis.com/css?family=Lato:300,400,700', array(), false, "all");

I think this is the part where the google fonts are “linked”/”activated”. In the beginning the 300,400,700 wasn’t there, so I added it, but didn’t help, nor did it result in an error. Just nothing changed…

The problem is, that the h1 headding should be much lighter. If I examine it in firefox, it says:

font-size: 89px;
font-family: 'Lato Light',Arial,'Arial Unicode MS',Helvetica,Sans-Serif;
font-weight: 300;
font-style: normal;

But if I look it up at google web fonts it looks much lighter.

Can you find the error? Thank you!!!