Answers:
DLUR = Down/Left/Up/Right
A = Rotate (A button)
SMPL = A word is enough to the wise.
DDDLL LDLAA ADUUR ULLLL LLA
SNCHRNZ = Birds of a feather flock together.
LUURR RRRUU DRRRD D
TLPTHC = You always must know on which side one's bread is buttered.
ULLAU AAADR RRRAA AUA
DNC RND = To beat about the bush.
RUULU UUULL LLULD URRDD LRUUL LDLDD
WRLSS = A bad workman quarrels with his tools.
ULLLA LDRRR RRDDD ULLLL LUAAA
CMMN WRK = Many hands make light work.
DLDRR RRRAL LURLA DUURR ADDUL LLDRR RRDRU UULAA RDA
BRK LN = An oak is not felled at one stroke.
RDDRD DDRRR RRULL LUADL URUAD LURUA AULDD
N DTL = All is fish that comes to his net.
LLLLL DDAUR RRRRR ADAAA UUADL LLUDL LUDRR RRRRR RDLLL LLLLL LLAAA RRRRU LAAA
DPL = He carries fire in one hand and water in the other.
UUUUU UDDDD RDLAA AUUUU DRRRR RURDR DDRLA AARUU LLDLD RRLLU LLLAA LLLUU