Greasy Fork is available in English.
How to use: You should see a menu bar on the right side of the screen, hover over it and the menu will slide out! When out click on the buttons shown! This should upgrade your tank automatically! If you don't know what the upgrades do, press [T] twice/once.
I'm currently developing the capability for users to create their own customized builds. However, I need to temporarily postpone this effort due to causing the server crash! :0