Hi there,
I was unhappy with Zanata's statistics as it's not having a global overview of translations in one language (please see https://l10n.gnome.org/teams/fr/ to have an idea of something helpful).
With the API, I decided to try to get some more information.
Despite the fact that API is pretty bad (I get many errors 415 I don't understand), I was able to get information project by project.
You can download the actual translation statistics at :
https://framadrop.org/r/P7f013QJZs#hXTuA+et/0Gr/Z9gqnKQj57AnsuNn822Cr/90z5rUkQ=
If you want to see/improve the code (especially the list of project/iteration), please access the link :
https://github.com/Jibec/fedora-zanata-statistics
Programming is not my profession, I'll be pleased to be advice and help.
If something better exists, I'm also interested.