Currently there is not an existing Portuguese Brazilian
language file for clipper, however you can read more about how these files are made, as well as information about how you can become an AppThemes translator to receive a theme discount
here.
You can find
other payment gateway options in the AppThemes marketplace if you do not wish to use PayPal. Currently you can charge users to post their coupons if you wish.
Yes, if you wish to allow customers to post coupons and publish them without moderation, you can.
No, there is no option to charge customers to actually use the coupons. You can only charge to post them.
Clipper is not currently a responsive theme, however this is planned for a future release. We do not have a confirmed time frame for this yet though, however. Thanks.