From FreeCAD Documentation
- Open all of the language folders of FreeCAD shown below
- Verify that a .ts file with your language code doesn't exist ("fr" for french, "de" for german, etc...)
- If it exists, you can download that file, if you want to modify/review/better the translation (click the file, then download)
- If it doesn't exist, download the .ts file without language code (or any other .ts available, it will work too)
- Rename that file with your language code
- Open it with the Qt-Linguist program
- Start translating (Qt Linguist is very easy to use)
- Once it's completely done, save your file
- send the files to us so we can include them in the Freecad source code so they benefit other users too.