structural_stiffness.
Presets were not updated when parameter were changed in rBe3d31b8dfbdc.
Note that will also check on generating more resistent py code for that
kind of presets, since that will also affect any custom preset made by
users...
i18n option
Actually, was broken for any custom modifier name, since it was explicitly using 'Cloth' one. Changed to mimic other cloth pressets (wonder why this one was different!).