Make safeMsg a module instead of a function parameter

[WorldLanguages]

We would no longer do this.

export default async function ({ addon, console, msg, safeMsg }) {
  element.innerHTML = `<div> ${safeMsg("hello")} </div>`;
  // ...

Instead. we would do this:

import { safeMsgBuilder } from "...";
export default async function ({ addon, console, msg }) {
  const safeMsg = safeMsgBuilder(msg);
  element.innerHTML = `<div> ${safeMsg("hello")} </div>`;
  // ...

The idea is that the module that exposes safeMsgBuilder should clearly show the escaping logic. This may help extension store reviewers determine that our safeMsg function is actually safe.