MSBuild should respect upstream tool language requests

[cdmihai]

Different upstream tools have different language configuration requirements:

• dotnet CLI sets DOTNET_CLI_UI_LANGUAGE and VSLANG (MSBuild should respect upstream tool language requests #1596 (comment) https://github.com/dotnet/cli/issues/9722#issuecomment-409358296)
• Visual Studio has a fallback mechanism guideline. In order:
  • VSLANG environmnent variable
  • /lcid command line switch
  • call GetConsoleFallbackUICulture (we only do this currently)

Related info: https://github.com/dotnet/cli/issues/4988#issuecomment-266836559

[nguerrera]

VSLANG is sufficient for CLI and VS since we set that when the language is overridden by means other than VSLANG.

[martinstein]

Is there a workaround while this is still in development? I've tried:

set DOTNET_CLI_UI_LANGUAGE=en

and also:

set VSLANG=1033

to try to get the msbuild output to switch to English when using the dotnet build command, but neither works.

[cdmihai]

Only option I know is to change the machine's language.