diff --git a/conf/app.conf b/conf/app.conf
index 3e6a0dc8..72d1e3ce 100644
--- a/conf/app.conf
+++ b/conf/app.conf
@@ -20,5 +20,4 @@ staticBaseUrl = "https://cdn.casbin.org"
 isDemoMode = false
 batchSize = 100
 ldapServerPort = 389
-languages = en,zh,es,fr,de,id,ja,ko,ru,vi
 quota = {"organization": -1, "user": -1, "application": -1, "provider": -1}
diff --git a/conf/conf.go b/conf/conf.go
index 4b201b48..c06a68cb 100644
--- a/conf/conf.go
+++ b/conf/conf.go
@@ -112,13 +112,8 @@ func GetLanguage(language string) string {
 
 	if len(language) < 2 {
 		return "en"
-	}
-
-	language = language[0:2]
-	if strings.Contains(GetConfigString("languages"), language) {
-		return language
 	} else {
-		return "en"
+		return language[0:2]
 	}
 }
 
diff --git a/i18n/util.go b/i18n/util.go
index 3ecc60c1..8b2d6b56 100644
--- a/i18n/util.go
+++ b/i18n/util.go
@@ -73,23 +73,27 @@ func applyData(data1 *I18nData, data2 *I18nData) {
 	}
 }
 
-func Translate(lang string, error string) string {
-	tokens := strings.SplitN(error, ":", 2)
-	if !strings.Contains(error, ":") || len(tokens) != 2 {
-		return "Translate Error: " + error
+func Translate(language string, errorText string) string {
+	tokens := strings.SplitN(errorText, ":", 2)
+	if !strings.Contains(errorText, ":") || len(tokens) != 2 {
+		return fmt.Sprintf("Translate error: the error text doesn't contain \":\", errorText = %s", errorText)
 	}
 
-	if langMap[lang] == nil {
-		file, _ := f.ReadFile("locales/" + lang + "/data.json")
+	if langMap[language] == nil {
+		file, err := f.ReadFile(fmt.Sprintf("locales/%s/data.json", language))
+		if err != nil {
+			return fmt.Sprintf("Translate error: the language \"%s\" is not supported, err = %s", language, err.Error())
+		}
+
 		data := I18nData{}
-		err := util.JsonToStruct(string(file), &data)
+		err = util.JsonToStruct(string(file), &data)
 		if err != nil {
 			panic(err)
 		}
-		langMap[lang] = data
+		langMap[language] = data
 	}
 
-	res := langMap[lang][tokens[0]][tokens[1]]
+	res := langMap[language][tokens[0]][tokens[1]]
 	if res == "" {
 		res = tokens[1]
 	}