connections.cgi: Fix Expires time Heading in Connections cgi page

- The Expires time heading for the Connections WUI page has seconds listed. However the
   code is converting the seconds to hours:minutes:seconds.
- This patch is changing the heading to H:M:S in English and the equivalent in the other
   languages. I have basewd this on the initial letter for Hours, Minutes & Seconds in
   each of the languages.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>

langs/es/cgi-bin/es.pl

@@ -1419,6 +1419,7 @@
 'hour-graph' => 'Hora',
 'hours' => 'horas',
 'hours2' => 'Horas',
+'hours:minutes:seconds' => 'H:M:S',
 'icmp selected but no type' => 'ICMP seleccionado como protocolo, pero no se ha seleccionado tipo de ICMP.',
 'icmp type' => 'Tipo de  ICMP',
 'id' => 'ID',
@@ -2291,7 +2292,6 @@
 'secondary dns' => 'DNS Secundario:',
 'secondary ntp server' => 'Servidor NTP Secundario',
 'secondary wins server address' => 'Dirección de servidor WINS Secundario',
-'seconds' => 'Segs',
 'secret' => 'Secreto',
 'section' => 'Sección',
 'secure shell server' => 'Servidor Secure Shell',