TLDR: Templates can now use datasets on Commons for all their localizable
messages, making it possible to copy/paste templates between wiki without
If you look at the Graph:Lines template , there is a small link under
each graph that points to the data source. That link is automatically
localized on enwiki and ruwiki because the actual messages are stored in a
Commons' Dataset, while the template itself is identical on both wikis.
The magic happens in the Module:TNT (hoping it won't blow up):