Add Italian language substitutions (#68)

Co-authored-by: Thomas Walter <[email protected]>

languages_substitution.go

@@ -20,6 +20,7 @@ func init() {
 		&grSub,
 		&huSub,
 		&idSub,
+		&itSub,
 		&kkSub,
 		&nbSub,
 		&nlSub,
@@ -123,6 +124,11 @@ var idSub = map[rune]string{
 	'&': "dan",
 }
 
+var itSub = map[rune]string{
+	'&': "e",
+	'@': "chiocciola",
+}
+
 var kkSub = map[rune]string{
 	'&': "jane",
 	'ә': "a",

slug.go

@@ -77,6 +77,8 @@ func MakeLang(s string, lang string) (slug string) {
 		slug = SubstituteRune(slug, huSub)
 	case "id", "idn", "ind":
 		slug = SubstituteRune(slug, idSub)
+	case "it", "ita":
+		slug = SubstituteRune(slug, itSub)
 	case "kz", "kk", "kaz":
 		slug = SubstituteRune(slug, kkSub)
 	case "nb", "nob":

slug_test.go

@@ -115,6 +115,8 @@ func TestSlugMakeLang(t *testing.T) {
 		{"fr", "This @ that", "this-arobase-that", true},
 		{"gr", "This & that", "this-kai-that", true},
 		{"id", "This & that", "this-dan-that", true},
+		{"it", "This & that", "this-e-that", true},
+		{"it", "This @ that", "this-chiocciola-that", true},
 		{"ell", "This & that", "this-kai-that", true},
 		{"Ell", "This & that", "this-kai-that", true},
 		{"kk", "This & that", "this-jane-that", true},