Variations in protonation in reaction mechanisms
English Wikipedia is more correct. Under acidic conditions, carbonyl and imine additions should happen via the oxocarbenium and the iminium ions, respectively.

Also, the in German version, the step between 5 and 6 is not a step; that's a resonance structure. There's also sloppiness in 3 and 10. Those attacks should come from the lone pair. Technically, those steps should've happened before the addition anyway, as I've already pointed out. Bottom line is that, again, the English version looks better.