This was flawed - while non-Latin text is now acceptable
in an IRI, we still need to be concerned with reserved characters
such as spaces, and Anki unfortunately has been storing the filenames
in unencoded form in the DB, meaning we must encode them at display
time. We won't be able to move away from this until existing notes
are rewritten, and it will probably require breaking compatibility with
older clients.
https://en.wikipedia.org/wiki/Internationalized_Resource_Identifier
This reverts commit 14110add55.
e97c381a6f