I've submitted a merge request that implements a new Wiki escaping mechanism that deals with some of the edge cases that give troubles currently (eg. the & character). The new system also allows all UTF8 characters in WIKI names and WIKI page names.
It should be a "drop-in" replacement and should function fine in place of the current system, but it would be good if some testing could take place before it is integrated. SO... I'm asking for the help of anyone who might be able to run it through some testing.
The merge request is on framagit for review: https://framagit.org/hubzilla/core/merge_requests/1321