References: golang.org/x/text/language.

const golang.org/x/text/language._de

2 uses

	golang.org/x/text/language (current package)
		parse.go#L234: 	"deutsch": _de,
		tables.go#L9: 	_de  = 269

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)