dnsforward.cgi: fix for language string

dnsforward.cgi: fix for language string

Hi,

In https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h=1a26564e95b5694337e51860544e7775d35055f3
the language string 'dnsforward forward_server' => 'DNS-Server', was deleted and replaced
by 'dnsforward forward_servers' => 'DNS-Server',

IMHO this leads to an empty string in 'dnsforward.cgi', line 223:

...
<td width='20%' class='base'>$Lang::tr{'dnsforward forward_server'}:&nbsp;<img src='/blob.gif' alt='*' /></td>
...

I changed this line...

Best,
Matthias

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>