Sublang

• Bulgarian
  • SUBLANG_DEFAULT

• Czech
  • SUBLANG_DEFAULT (Visual Studio requires this.)

• Chinese

• Danish
  • SUBLANG_DEFAULT (Visual Studio requires this.)

• Dutch

• English
  • SUBLANG_NEUTRAL (Visual Studio requires this.)

• French
  • SUBLANG_NEUTRAL (Visual Studio requires this.)

• Frisian

• Finnish

• German
  • SUBLANG_NEUTRAL

• Greek

• Hungarian

• Icelandic

• Irish Gaelic

• Italian

• Japanese
  • SUBLANG_DEFAULT (Visual Studio requires this.)

• Lithuanian

• Norweigan
  • SUBLANG_NORWEGIAN_BOKMAL
  • SUBLANG_NORWEGIAN_NYNORSK

• Persian

• Polish
  • SUBLANG_NEUTRAL

• Portuguese
  • SUBLANG_PORTUGUESE
  • SUBLANG_PORTUGUESE_BRAZILIAN

• Romanian

• Russian

• Spanish
  • SUBLANG_NEUTRAL (Visual Studio requires this.)

• Swedish
  • SUBLANG_NEUTRAL (Visual Studio requires this.)

• Urdu

For more info see SubLanguage Identifiers

Taking a glance at the ReactOS source code, it looks like ROS doesn't support the new SUBLANG identifyers introduced in Windows Vista (for example, SUBLANG_PORTUGUESE_PORTUGAL).