Thanks for this hint. The menu-option not appears in this case, because it is inside the condition for the register-option.
If you don't allow new registrations, but you want to have the language-option shown in the navbar, do this:
Look in the template
navbar for
Code:
<td class="vbmenu_control"><a href="register.php?$session[sessionurl]">$vbphrase[register]</a></td>
and insert BEFORE this:
Code:
<if condition="$show['popups'] AND $bbuserinfo['userid'] == 0">
<td id="guestlanguage" class="vbmenu_control"><a href="#guestlanguage">$vbphrase[guestlanguage]</a> <script type="text/javascript"> vbmenu_register("guestlanguage"); </script></td>
</if>
J?rg