French translation: fix some errors and ortho (#513)

_TarkFrench

2019-10-26 c41f6509cf2758945fbc0810ff9d7ab0fc077228

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local S = technic.getter
 
function technic.register_electric_furnace(data)
    data.typename = "cooking"
    data.machine_name = "electric_furnace"
    data.machine_desc = S("%s Furnace")
    technic.register_base_machine(data)
end