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

_TarkFrench

2019-10-26 c41f6509cf2758945fbc0810ff9d7ab0fc077228

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local S = technic.getter
 
if minetest.registered_nodes["default:furnace"].description == "Furnace" then
    minetest.override_item("default:furnace", { description = S("Fuel-Fired Furnace") })
end