libraries-override for localization

Oh dear; looking at this...I think I need to update that documentation, because the library is aggregating the minimized JS file now, so doing it that way is going to get more complicated...

If you only need to override one, it would probably be easiest to just to override it at runtime; this could go in any theme JS.

// Listen for event

const overrideEd11y = function() {
  Ed11y.M.linkNewWindow = {
      title: 'Manual check: is opening a new window expected?',
      tip: () =>
        `<p>Readers can always choose to open a link a new window. When a link forces open a new window, it can be confusing and annoying, especially for assistive device users who may wonder why their browser's "back" button is suddenly disabled.</p>
                <p>There are two general exceptions:</p>
                <ul>
                    <li>When the user is filling out a form, and opening a link in the same window would cause them to lose their work.</li>
                    <li>When the user is clearly warned a link will open a new window.</li>
                </ul>
                <p><strong>To fix:</strong> set this link back its default target, or add a screen-reader accessible warning (text or an icon with alt text).</p>
                `,
    },
  document.removeEventListener('ed11yResults', overrideEd11y);
}

document.addEventListener('ed11yResults', overrideEd11y);

I believe that worked, thank you! Do you want to leave this open as a reminder to update the README, or go ahead and close it?

Great!

Yeah I'll leave this open so I remember to include this in the next release.