fix: fix custom l18n

lib/GMLIB_API-JS.js

@@ -709,17 +709,28 @@ class JsonLanguage extends JsonConfig {
 
 class JsonI18n {
     constructor(path, localLangCode = "en_US") {
+        if (!path.endsWith("/") && !path.endsWith("\\")) {
+            path = path + "/";
+        }
         this.mPath = path;
         this.mLangCode = localLangCode;
         this.mAllLanguages = {};
-        this.mDefaultLangCode = "en_US"
+        this.mDefaultLangCode = "en_US";
+        this.loadAllLanguages();
+    }
+
+    loadAllLanguages() {
+        let exist_list = File.getFilesList(this.mPath);
+        exist_list.forEach((name) => {
+            let code = name.replace(".json", "");
+            let path = this.mPath + name;
+            let language = new JsonLanguage(path);
+            this.mAllLanguages[code] = language;
+        });
     }
 
     loadLanguage(langCode, defaultData = {}) {
         let langPath = this.mPath;
-        if (!langPath.endsWith("/") && !langPath.endsWith("\\")) {
-            langPath = langPath + "/";
-        }
         langPath = langPath + langCode + ".json";
         let language = new JsonLanguage(langPath, defaultData);
         this.mAllLanguages[langCode] = language;