add

app/admin/lang/en/index.php

@@ -0,0 +1,9 @@
+<?php
+return [
+    'No background menu, please contact super administrator!'       => 'No background menu, please contact the super administrator!',
+    'You have already logged in. There is no need to log in again~' => 'You have already logged in, no need to log in again.',
+    'Login succeeded!'                                              => 'Login successful!',
+    'Incorrect user name or password!'                              => 'Incorrect username or password!',
+    'Login'                                                         => 'Login',
+    'Logout'                                                        => 'Logout',
+];