Dpkg::Control::HashCore: Use proper quotes

Reverts partial regression introduced with cherry pick in commit
aea291e3db1ac0414dcf005a0a607e78bdd77a5e.

scripts/Dpkg/Control/HashCore.pm

@@ -247,7 +247,7 @@ sub parse {
 		chomp;
 		unless (m/^-----BEGIN PGP SIGNATURE-----[\r\t ]*$/) {
 		    $self->parse_error($desc, g_('expected OpenPGP signature, ' .
-		                                 "found something else \`%s'"), $_);
+		                                 "found something else '%s'"), $_);
                 }
 		# Skip OpenPGP signature
 		while (<$fh>) {

scripts/po/de.po

@@ -2466,7 +2466,7 @@ msgstr "OpenPGP-Signatur erwartet, Dateiende nach einer Leerzeile gefunden"
 
 #: scripts/Dpkg/Control/HashCore.pm
 #, perl-format
-msgid "expected OpenPGP signature, found something else `%s'"
+msgid "expected OpenPGP signature, found something else '%s'"
 msgstr "OpenPGP-Signatur erwartet, etwas anderes gefunden »%s«"
 
 #: scripts/Dpkg/Control/HashCore.pm