New user registration is currently disabled due to spam abuse / Регистрация новых пользователей в настоящее время приостановлена из-за злоупотреблений спаммерами
Depends on the dictionary format. E.g. DSL files are text files which can be edited. Others can not be edited that easily. GD does not currently provide a facility to rename dictionaries, at least as of 1.4.1.