国际化，Meteor.Error修正
Created by: marchtian
throw new Meteor.Error(400, "space_users_error_user_exists"); 应改为 throw new Meteor.Error(400, t("space_users_error_user_exists"));
否则
Created by: marchtian
throw new Meteor.Error(400, "space_users_error_user_exists"); 应改为 throw new Meteor.Error(400, t("space_users_error_user_exists"));
否则