Enable the @typescript-eslint/no-unsafe-member-access eslint rule (#1833)

## Description:

Enable the `@typescript-eslint/no-unsafe-member-access` eslint rule.

Fixes #1783

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

src/client/LanguageModal.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unsafe-member-access */
 import { LitElement, html } from "lit";
 import { customElement, property } from "lit/decorators.js";
 import { translateText } from "../client/Utils";