All french Moto G3 with stock rom i have seen have "retfr" like this:
I have tried all RETEU firmware (5.1.1, 6.0 and 6.0.1) and same problem..
"retes" can't be edited in build.prop, i have only the line before ("23.31.22.osprey_reteu.reteu.en.EU" for exemple in the uploaded image)