This site uses the US names for characters.
Claw is Vega
Boxer is Balrog
Dictator is M. Bison.
B / F / U / D is back, forward, up and down
LP / MP / HP are light punch, medium punch, heavy punch
LK / MK / HK are light kick, medium kick, heavy kick
3P / 3K are all three punches or kick buttons pressed together
S / C / J / NJ are standing, crouching, jumping, neutral jumping (straight up)
CL is close, a different normal you only get when right next to the opponent