GUI: Some simple FW-Log cosmetics

I altered 'showrequestfromcountry.dat', 'showrequestfromip.dat' and 'showrequestfromport.dat'
in the same manner as the 'Loggraphs'-Pages in commit

Each 'Details'-page got a unique title.

Furthermore, I added a 'Back'-Button to go back to the previous page. For this, I used
'back.png' from 'wio' (thanks Stephan! ;-) ) since I found no other appropriate image.

'ipinfo.cgi' got a centered 'Back'-Button, too.

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

html/cgi-bin/ipinfo.cgi

@@ -102,7 +102,7 @@ print <<END
 <div align='center'>
 <table width='80%'>
 <tr>
-	<td align='center'><a href='$ENV{'HTTP_REFERER'}'>$Lang::tr{'back'}</a></td>
+	<td align='center'><a href='$ENV{'HTTP_REFERER'}'><img src='/images/back.png' alt='$Lang::tr{'back'}' title='$Lang::tr{'back'}' /></a></td>
 </tr>
 </table>
 </div>