I back to fedora. Because I joined Red Hat in last month.
And I need an account about translate.fedoraproject.org.
Whom should I contact to?

Welcome!

To know how to get translator account and other translation related stuffs, please refer to Translation Quick Start Guide located at http://docs.fedoraproject.org/translation-quick-start-guide/

You can reach other Japanese translators by subscribing to mailing list: https://admin.fedoraproject.org/mailman/listinfo/trans-ja

hth

Shanky