diff --git a/mailcow/src/mailcow-dockerized/helper-scripts/add-new-lang-keys.php b/mailcow/src/mailcow-dockerized/helper-scripts/add-new-lang-keys.php
new file mode 100644
index 0000000..19010f8
--- /dev/null
+++ b/mailcow/src/mailcow-dockerized/helper-scripts/add-new-lang-keys.php
@@ -0,0 +1,63 @@
+<?php
+
+function array_diff_key_recursive (array $arr1, array $arr2) {
+  $diff = array_diff_key($arr1, $arr2);
+  $intersect = array_intersect_key($arr1, $arr2);
+
+  foreach ($intersect as $k => $v) {
+    if (is_array($arr1[$k]) && is_array($arr2[$k])) {
+      $d = array_diff_key_recursive($arr1[$k], $arr2[$k]);
+
+      if ($d) {
+        $diff[$k] = $d;
+      }
+    }
+  }
+
+  return $diff;
+}
+
+// target lang
+$targetLang = $argv[1];
+
+if(empty($targetLang)) {
+  die('Please specify target lang as the first argument, to which you want to add missing keys from master lang (EN). Use the lowercase name,
+  for example `sk` for the Slovak language'."\n");
+}
+
+// load master lang
+$masterLang = file_get_contents(__DIR__.'/../data/web/lang/lang.en.json');
+$masterLang = json_decode($masterLang, true);
+
+// load target lang
+$lang = file_get_contents(__DIR__.'/../data/web/lang/lang.'.$targetLang.'.json');
+$lang = json_decode($lang, true);
+
+// compare lang keys
+$result = array_diff_key_recursive($masterLang, $lang);
+
+if(empty($result)) {
+  die('No new keys were added. Looks like target lang is up to date.'."\n");
+}
+
+foreach($result as $key => $val) {
+  // check if section key exists in target lang
+  if(array_key_exists($key, $lang)) {
+    // add only missing section keys
+    foreach ($val as $k => $v) {
+      $lang[$key][$k] = $v;
+    }
+    // sort keys
+    ksort($lang[$key]);
+  } else {
+    // add whole section
+    $lang[$key] = $val;
+    ksort($lang);
+  }
+}
+
+$lang = json_encode($lang, JSON_PRETTY_PRINT|JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
+file_put_contents(__DIR__.'/../data/web/lang/lang.'.$targetLang.'.json', $lang);
+
+echo 'Following new lang keys were added and need translation:'."\n";
+print_r($result);