Rename Shipping Method

Hey guys, I hope you can help me. I use your plugin and everything works fine. But there is one thing I hope a change is possible. I have a german shop and the name of the standard shipping method from Printful is “Flatrate”. Is there a way to rename it to Standardversand? With a script or something like that? Because Flatrate is very confusing for my german custormer.

Thanks!

The page I need help with: [log in to see the link]