it would be easier than at github
I'm writing down my experiences here. But you have to decide what you want.
if you take value on opensource, you can use #weblate. otherwise i hang out a lot on #crowdin.
at #transifex it can be that you are rejected or that it takes a long time until you are accepted.
there are several translation tools. weblate crowdin transifex bubu weblate
it would be easier than at github I'm writing down my experiences here. But you have to decide what you want. if you take value on opensource, you can use #weblate. otherwise i hang out a lot on #crowdin. at #transifex it can be that you are rejected or that it takes a long time until you are accepted.