Translate NINJA-IDE to your language is really simple, you only need to edit the proper .tz file (Qt Translation file - xml structure). Let's see how:
You just need to get "Qt Linguist", open the translation file there, write the proper string to be match for your language (the ui is really intuitive), and you are done!
To propose a branch with the new translated file, you need to fork this repository:
Create a new folder with your language, place the translated file in there and send the Pull Request! :D