We are not sure yet, especially about having enough strings to qualify for translatewiki.net
That's possible, but which repositories are you talking about? Just for information, what's the reason they're not hosted in gerrit? (Maybe because they're forks, judging from the descriptions.)
I found  and  but you need to add the corresponding qqq.json for message documentation. Please also add @translatewiki as user with push access on all repositories you want to add. Let us know when you've done both.
Besides, while you write message documentation you may want to check whether you respect mw:Localisation advice, including for Plural and Gender. For instance I see a message group-confirmed-member without GENDER, which may be expected.
Hello, I am currently collaborating and I am working on the Spanish translations and other languages of the messages of that wiki that are currently processed in the MirahezeMagic extension, I am going to add GENDER to the Spanish translations. I am available for what is needed in this area. Regards.