Martin Brunner asked:
The problem now is, that many mail clients (such as Outlook Web-App) won't recognize the ) being part of the URL and just will open https://en.wikipedia.org/wiki/Amsterdam_(disambiguation on click - which does not work of course.
So this might be a failure of most browser or mail clients - but can this be solved via Mediawiki?
I cannot see an easy way, other than completely disallowing parens in your wiki by modifying $wgLegalTitleChars. Rather a brute force approach of course.