Title bugs

[Tapao-NonSen]

Bug Report

Current Behavior
A clear and concise description of the behavior.

Steps to Reproduce

1. Create some discussion include quot in the title "
2. Now you got it

Expected Behavior
Normal title
Input: "welcome"
Output: "welcome" not "welcome"

Screenshots
https://imgur.com/hqbFO9h

[clarkwinkelmann]

The problem appears to be related to this change askvortsov1/rich-icu-message-formatter@7d0a31c

The characters &<>"' are replaced with HTML entities. But both Mithril and document.title are unable to deal with them.

The unit tests in askvortsov/rich-icu-message-formatter don't cover Mithril through .rich() and I'm not even sure where to add those tests in a way that makes sense. I'm really not sure why this change was made since it's only tested against a custom formatter implemented just for the tests.

Paging @askvortsov1 for help.

Edit: a simpler example to show the issue

app.translator.trans('core.forum.post_stream.time_lapsed_text', {period: '"test"'})
Array [ ""test"", " later" ]

Expected: quotes should not be HTML entities in output.

[askvortsov1]

Opened askvortsov1/rich-icu-message-formatter#1 to fix this, would appreciate review from @flarum/core before I merge, release, and bump core's deps in case there's anything I missed.