A: It is recommended but not mandatory. The products marketed in Japanese tend to sell much better than those marketed only in English. Marketing your products in the Japanese language could increase your exposure and ultimately, your sales.
The Japanese language is rather complex; so that using machine translators almost always results in an inaccurate translation at best and a completely ruined marketing campaign at worst.
CuriousFactory offers professional translation.
http://cf-create.com/eng/individual/
Please contact us for further information: distribution@curiousfactory.com