$lang_client_mailbox_1
  $lang_client_mailbox_2
    $lang_client_mailbox_10
  $lang_client_mailbox_3
    $lang_client_mailbox_11
  $lang_client_mailbox_4
    $lang_client_mailbox_12
  $lang_client_mailbox_5
    $lang_client_mailbox_13
  $lang_client_mailbox_6
    $lang_client_mailbox_14
  $lang_client_mailbox_7
    $lang_client_mailbox_15
  $lang_client_mailbox_8
    $lang_client_mailbox_16
  $lang_client_mailbox_9
    $lang_client_mailbox_17