This is the french translation of all the QString declared via tr() in the source of NifSkope. The file NifSkope_fr.ts has to be put in the lang directory. The patch has to be applied to nifskope.cpp for compiling a binary able to use the translation files.
After applying the patch, do a "qmake-qt4 -project" in order to refresh the project with the new translation file and do a "lupdate lang/*.ts" to create the *.qm files. Finally, you can compile as classical to get a Nifskope able to detect the locale and to adapt to it.