Adds support for greek substitutions.

languages_substitution.go

@@ -43,3 +43,15 @@ var esSub = map[rune]string{
 	'&': "y",
 	'@': "en",
 }
+
+var grSub = map[rune]string{
+	'&': "kai",
+	'η': "i",
+	'ή': "i",
+	'Η': "i",
+	'ι': "i",
+	'ί': "i",
+	'Ι': "i",
+	'χ': "x",
+	'Χ': "x",
+}

slug.go

@@ -60,6 +60,8 @@ func MakeLang(s string, lang string) (slug string) {
 		slug = SubstituteRune(slug, plSub)
 	case "es":
 		slug = SubstituteRune(slug, esSub)
+	case "gr":
+		slug = SubstituteRune(slug, grSub)
 	default: // fallback to "en" if lang not found
 		slug = SubstituteRune(slug, enSub)
 	}

slug_test.go

@@ -69,6 +69,7 @@ func TestSlugMakeLang(t *testing.T) {
 		{"de", "This & that", "this-und-that"},
 		{"pl", "This & that", "this-i-that"},
 		{"es", "This & that", "this-y-that"},
+		{"gr", "This & that", "this-kai-that"},
 		{"test", "This & that", "this-and-that"}, // unknown lang, fallback to "en"
 	}