diff --git a/src/modules/sub/utils.js b/src/modules/sub/utils.js
index e965bd9a..0db85649 100644
--- a/src/modules/sub/utils.js
+++ b/src/modules/sub/utils.js
@@ -1,30 +1,43 @@
 const forbiddenCharsString = ['}', '{', '%', '>', '<', '^', ';', '`', '$', '"', "@", '='];
 
 export function metadataManager(obj) {
-    let keys = Object.keys(obj);
-    let tags = ["album", "composer", "genre", "copyright", "encoded_by", "title", "language", "artist", "album_artist", "performer", "disc", "publisher", "track", "encoder", "compilation", "date", "creation_time", "comment"]
+    const keys = Object.keys(obj);
+    const tags = [
+        "album",
+        "copyright",
+        "title",
+        "artist",
+        "track",
+        "date"
+    ]
     let commands = []
 
-    for (let i in keys) { if (tags.includes(keys[i])) commands.push('-metadata', `${keys[i]}=${obj[keys[i]]}`) }
+    for (const i in keys) {
+        if (tags.includes(keys[i]))
+            commands.push('-metadata', `${keys[i]}=${obj[keys[i]]}`)
+        }
     return commands;
 }
 
 export function cleanString(string) {
-    for (let i in forbiddenCharsString) {
-        string = string.replaceAll("/", "_").replaceAll(forbiddenCharsString[i], '')
+    for (const i in forbiddenCharsString) {
+        string = string.replaceAll("/", "_")
+                       .replaceAll(forbiddenCharsString[i], '')
     }
     return string;
 }
 export function verifyLanguageCode(code) {
-    return RegExp(/[a-z]{2}/).test(String(code.slice(0, 2).toLowerCase())) ? String(code.slice(0, 2).toLowerCase()) : "en"
+    const languageCode = String(code.slice(0, 2).toLowerCase());
+    if (RegExp(/[a-z]{2}/).test(languageCode)) {
+        return languageCode
+    }
+    return "en"
 }
 export function languageCode(req) {
-    return req.header('Accept-Language') ? verifyLanguageCode(req.header('Accept-Language')) : "en"
-}
-export function unicodeDecode(str) {
-    return str.replace(/\\u[\dA-F]{4}/gi, (unicode) => {
-        return String.fromCharCode(parseInt(unicode.replace(/\\u/g, ""), 16));
-    });
+    if (req.header('Accept-Language')) {
+        return verifyLanguageCode(req.header('Accept-Language'))
+    }
+    return "en"
 }
 export function cleanHTML(html) {
     let clean = html.replace(/ {4}/g, '');