Add font group per text zone

We found the color group feature really great to match user choice with our available item colors.

In the same way, it'll be really usefull to constrain the user with fonts group per text zone - like color groups.

In our case, manufacturing constraints don't allow to choose every available fonts for every single text zone, so we deactivate font selection for a huge amount of products,

With this kind of feature, we could add suitable fonts according to our process possibilities.

Thanks :)