Bug 36516: Fix useless warning from translation script

I lost too much time trying to know what the translation script outputs
  sh: 1: Syntax error: end of file unexpected

To recreate:
touch 'koha-tmpl/intranet-tmpl/prog/en/modules/<' (yes, don't ask!)
koha-translate -i de-DE --dev kohadev
or
koha-translate -u de-DE --dev kohadev

And you get the shell error without any ideas what's happening!

With this patch applied you will not get any errors because the quote
will actually copy the file (what is expected).

But without the quote the cp command will fail and the explanation will be
displayed
sh: 1: Syntax error: end of file unexpected
Cannot copy /kohadevbox/koha/koha-tmpl/intranet-tmpl/prog/en/modules/< to /kohadevbox/koha/koha-tmpl/intranet-tmpl/prog/de-DE/modules/< at /kohadevbox/koha/misc/translator/tmpl_process3.pl line 385.

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 0026ee3e97)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 2001b853f4)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

misc/translator/tmpl_process3.pl

@@ -381,7 +381,7 @@ if ($action eq 'install') {
         } else {
         # just copying the file
             mkdir_recursive($targetdir) unless -d $targetdir;
-            system("cp -f $input $target");
+            system("cp -f '$input' '$target'") == 0 or warn "Cannot copy $input to $target";
             print STDERR "Copying $input...\n" unless $quiet;
         }
     }