[Fix] Unicode chars in non-steam-game error dialog

[redromnon]

The unicode appears in the dialog box because i18next escapes the value to avoid XSS injection attacks by default. Solved by turning off the escaping flag.

Related Issue: #1867

Use the following Checklist if you have changed something on the Backend or Frontend:

• [ ] Tested the feature and it's working on a current and clean install.
• [ ] Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• [ ] Created / Updated Tests (If necessary)
• [ ] Created / Updated documentation (If necessary)