Fix intermittent failures in UserMailer specs

Description

In some UserMailer specs, we are checking the undecoded content of emails, so tests fail when Faker happens to return non-ASCII characters for work titles.

This is the same issue as AO3-5817.

How to test: none, automated.

Environment

None

Assignee

redsummernight

Reporter

redsummernight

Roadmap

Internationalization
Misc

Priority

Low

Affects versions

Fix versions

Components

AutomatedTests

Difficulty

Medium

Required Access Level

None

Milestone

Internal 0.9
Configure