Currently, only @olafgrabienski gets notified when new accounts are created in localize.backdropcms.org. He then has to manually activate the accounts, and communicate with people that want to contribute to specific language.
Ideally, we should automate these notifications, so that they go in a Zulip stream (same as we do for new forum posts). That way, we could crowd-source the activation of the accounts and the onboarding of new translators.
Till that happens, we should have more people help @olafgrabienski out.