Don't replace \n in msg strings in po file

Change-Id: I06b8a0d7676cbfad3d6b9677304db72b79ebb173

mahara-langpacks/update-po-from-pot.pl

@@ -62,7 +62,6 @@ foreach my $entry (@$trstrings) {
 
     if ( defined $content ) {
         # Non-plural translation
-        $content =~ s{\\n}{\n}g;
         next if ( $content eq '' || $content eq '""' );
     }
     if ( defined $content_n ) {
@@ -70,7 +69,6 @@ foreach my $entry (@$trstrings) {
         # untranslated, we can leave this entry out of the file.
         my $anything = 0;
         foreach my $k ( keys %$content_n ) {
-            $content_n->{$k} =~ s{\\n}{\n}g;
             $anything ||= ($content_n->{$k} ne '' && $content_n->{$k} ne '""');
         }
         next if ! $anything;