Metadata appender is stripping special characters.

Nice catch, it looks like we are stripping out way too many characters when we don't need to. Instead of trying to remove the "unsafe" characters I think it's best to just escape the few that PostScript actually cares about. I'll add a merge request to fix this.

@sunny-lee - If you could take a look, this should now preserve characters now.

Looks good! Tried with various content types and it works! Previously ids would have the slashes and ampersands stripped out but this fix works and after resave, fixes the issue.

Thanks for testing!