on world change:
if player is in world "spawn":
set {worldname::%player%} to "Başlangıç"
else if player is in world "world":
set {worldname::%player%} to "Orman"
else if player is in world "world_nether":
set {worldname::%player%} to "Cehennem"
else if player is in world "world_the_end":
set {worldname::%player%} to "Son"
else:
set {worldname::%player%} to "Neredeyim ben?"