Remove now superfluous lowercasing

See #2615
See #1129

hugolib/multilingual.go

@@ -83,7 +83,6 @@ func toSortedLanguages(l map[string]interface{}) (helpers.Languages, error) {
 
 	for lang, langConf := range l {
 		langsMap, err := cast.ToStringMapE(langConf)
-		helpers.ToLowerMap(langsMap)
 
 		if err != nil {
 			return nil, fmt.Errorf("Language config is not a map: %T", langConf)

hugolib/site_test.go

@@ -337,9 +337,8 @@ func doTestShouldAlwaysHaveUglyURLs(t *testing.T, uglyURLs bool) {
 	viper.Set("disableRSS", false)
 	viper.Set("rssURI", "index.xml")
 	viper.Set("blackfriday",
-		// TODO(bep) https://github.com/spf13/viper/issues/261
 		map[string]interface{}{
-			strings.ToLower("plainIDAnchors"): true})
+			"plainIDAnchors": true})
 
 	viper.Set("uglyURLs", uglyURLs)
 
@@ -965,9 +964,8 @@ func setupLinkingMockSite(t *testing.T) *Site {
 	viper.Set("pluralizeListTitles", false)
 	viper.Set("canonifyURLs", false)
 	viper.Set("blackfriday",
-		// TODO(bep) see https://github.com/spf13/viper/issues/261
 		map[string]interface{}{
-			strings.ToLower("sourceRelativeLinksProjectFolder"): "/docs"})
+			"sourceRelativeLinksProjectFolder": "/docs"})
 
 	site := &Site{
 		Source:   &source.InMemorySource{ByteSource: sources},