What syntax does the Current Language property take in a SQL Server connection string?

The documentation says:

Sets the language used for database server warning or error messages.

The language name can be 128 characters or less.

Which tells me zip about the actual format I'm supposed to use. Does it take a numeric LCID? A textual language name? In what format? en-US? English? Is it case sensitive? And so on.

And I presume "Current Language" and "Language" are equivalent for the purposes of tha开发者_如何学编程t property?

connectionstrings.com says

The SQL Server Language record name.

So it will be one of the values you'd use for SET LANGUAGE which in turn comes from sys.syslanguages