language/lang_english/lang

language/lang_english/lang_admin.php

 NOTE --- Remember to do this for all your installed languages!

FIND:
```
//
// Forum Management
//
```

BEFORE, ADD:

// Autologin Keys - added 2.0.18
$lang['Allow_autologin'] = 'Allow automatic logins';
$lang['Allow_autologin_explain'] = 'Determines whether users are allowed to select to be automatically logged in when visiting the forum';
$lang['Autologin_time'] = 'Automatic login key expiry';
$lang['Autologin_time_explain'] = 'How long a autologin key is valid for in days if the user does not visit the board. Set to zero to disable expiry.';

FIND:

 NOTE --- This is a partial match, the whole line for the english version looks like this:
	$lang['Stylesheet'] = 'CSS Stylesheet';

$lang['Stylesheet'] =

AFTER, ADD:

$lang['Stylesheet_explain'] = 'Filename for CSS stylesheet to use for this theme.';