The `for lang` does not work on targets: D, Dart and Haxe

[matheusjohannaraujo]

for C:
    print("Target C")

for D:
    print("Target D")

for JS:
    print("Target JavaScript")

for DART:
    print("Target Dart")

for HAXE:
    print("Target Haxe")

for PY:
    print("Target Python")

[matheusjohannaraujo]

Ideally, for lang should accept both the abbreviation and the full language name regardless of Upper or Lowercase. E.g.: JS JavaScript, PY Python, D DMD, HX Haxe...