It's a good idea for extensions to regularly receive translations from translatewiki.net (not that we really have a choice in the matter), but what does it mean to regularly submit them?
Topic on Talk:Best practices for extensions/Flow
I've added:
For extensions hosted in Wikimedia Gerrit, translatewiki.net staff will generally proactively do this for you. They start an automatic process which subscribes to new messages from your extension, and also automatically exports and merges updated translations back into your repository once a day. If this hasn't happened within a week, contact TWN staff.
I copied and summarised this from the translatewiki.net page, which was previously linked from the same bullet point.
Thanks, that looks good to me.