Hello from cold Russia.
1)Don't use the grounding wire to connect N pin on your wall switch. If you don't want to win Darwin award.
Look at the first picture.
2)Use capasitors to connect the switch and the bulb.
Look at the second picture.
C1 - Capacity. Metal-film capacitor for 400 volts.
It works as a "quenching capacitor" or "resistance". In order for the "part of the current" to remain on the switch and feed it, in the switched on position of the key.
C2 - Capacity. Metal-film capacitor for 400 volts.
Works as a "bypass" resistor. Serves to ensure that energy-saving gas-discharge or LED lamps do not blink (from the current passing through them supplying the switch) in the off position of the key.