diff --git a/inc/form.class.php b/inc/form.class.php
index 8089daef3..8a98e81cc 100644
--- a/inc/form.class.php
+++ b/inc/form.class.php
@@ -2437,6 +2437,16 @@ public function setTranslations(string $language, array $translations) : bool {
          return false;
       }
 
+      // CLeanup obsolete strings
+      $existing_strings = $this->getTranslatableStrings();
+      foreach (array_keys($translations) as $original) {
+         if (!in_array($original, $existing_strings['itemlink'])
+            && !in_array($original, $existing_strings['string'])
+            && !in_array($original, $existing_strings['text'])) {
+            unset($translations[$original]);
+         }
+      }
+
       $output = "<?php" . PHP_EOL . "return " . var_export($translations, true) . ";";
       $written = file_put_contents(
          $file,