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/en/cgi-bin/en.pl

@@ -1073,7 +1073,7 @@
 'external access rule removed' => ' External access rule removed; restarting access controller',
 'external aliases configuration' => 'External aliases configuration',
 'extrahd' => 'ExtraHD',
-'extrahd because it is outside the allowed mount path' => ', because it is outside the allowed mount path',
+'extrahd because it it outside the allowed mount path' => ', because it is outside the allowed mount path',
 'extrahd because there is already a device mounted' => ', because there is already a device mounted',
 'extrahd cant umount' => 'Can\'t umount',
 'extrahd detected drives' => 'detected drives',
@@ -1420,6 +1420,7 @@
 'hour-graph' => 'Hour',
 'hours' => 'Hours',
 'hours2' => 'Hours',
+'hours:minutes:seconds' => 'H:M:S',
 'icmp selected but no type' => 'ICMP selected for protocol, but no ICMP type specified.',
 'icmp type' => 'ICMP Type',
 'id' => 'ID',
@@ -2279,7 +2280,6 @@
 'secondary dns' => 'Secondary DNS:',
 'secondary ntp server' => 'Secondary NTP server',
 'secondary wins server address' => 'Secondary WINS server address',
-'seconds' => 'Secs',
 'secret' => 'Secret',
 'section' => 'Section',
 'secure shell server' => 'Secure Shell Server',