vpnmain.cgi: Fix for 2nd part of bug10595

vpnmain.cgi: Fix for 2nd part of bug10595

- Bug10595 had two parts in it and was closed after the first part was fixed. The second
   part was still unfixed at that time. I cam across it when checking out an open bug on
   a similar issue with OpenVPN.
- I found the section that checks on the CA Name and modified it to also allow spaces.
- Having modified that then the subroutines getsubjectfromcert and getCNfromcert required
   modifications otherwise the openssl statement only got a filename with the first
   portion of the ca name until the first space was encountered. This v2 version of this
   patch set has the safe approach suggested by @Michael. This v3 version has been
   re based to another patch submission that modified lines in a similar place and
   prevented a merge to work.
- I am open to any suggestions for improvements to how I implemented the use of the
   &General::system_output function
- Tested this change out on my vm and it worked fine. I was able to upload a ca
   certificate into IPSec and use spaces in the CA Name.
- Changed the test for the CA_NAME to allow spaces. Change also made to en.pl file

Fixes: Bug10595 part 2
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>