How do I make a speech recognition system which executes my voice commands? Which language should I use for this?

How do I make a speech recognition system which executes my voice commands? Which language should I use for this?

N.B.

1) Nobody makes all of this from scratch.

2) Programming languages are not as important as algorithms.

For details, see all my Quora answers:
=> quora.com/Marcus-L-Endicott/answers