time.cgi: add current date-time to this WebGUI page

- added words and date-time format to english (en.pl)
- other languages are needed
- seconds included since time is accurate to < .1s
https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=2234e8aacac2e0d0b06dac4513585c15c2b3b440

Code-by: Leo-Andres Hofmann <hofmann@leo-andres.de>
Signed-off-by: Jon Murphy <jon.murphy@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

html/cgi-bin/time.cgi

@@ -287,6 +287,10 @@ print <<END
 </table>
 END
 ;
+
+my $now = strftime($Lang::tr{'timeformat'}, localtime);
+print "<hr>$Lang::tr{'system time'}: $now";
+
 &Header::closebox();
 &Header::openbox('100%',1,$Lang::tr{'ntp sync'});
 print <<END