Hi Shirayuki,
I want to thank you for making so many templates translatable. But please beware of this breakage this causes on existing transclusions. If you don't first update links to the template before making it translatable, this is considered a regression, not an improvement. It's a lot of work to do, I understand. And maybe we should fine a way to make it work with existing transclusions, but until that is the case, please don't make templates translatable until all usage is fixed to use TNT.
For example, "OnWikimedia" at Extension:Kartographer is currently broken.