Issue title: HTML Entities in Browser Title
 Issue body: ## Bug Report

**Current Behavior**
HTML Entities in browser title.

**Steps to Reproduce**
1. Create a post with a title that includes apostrophes
2. Look at tab title

**Screenshots**
![](https://i.ibb.co/JK74kp9/Screen-Shot-2022-02-08-at-3-20-21-AM.png)

**Environment**
- Flarum version: 1.2
- Website URL: https://discuss.flarum.org
- Browser: Safari
 Comments: 
 Comment 0: Thanks for the report!

This was fixed by a7254773dd1a22f43b1d7ee714fe29737ba9fa9f. :)
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