Links break highlighting

[NullVoxPopuli]

Code:

import { service } from 'ember-primitives';
import { ExternalLink } from 'ember-primitives';

export const Header = <template>
  {{#let (service "data") as |data|}}

    <h1>
      <span class="title">
        Is Polaris ready yet?
      </span>
      <!-- <span class="answer">Yes!</span> -->
      <span class="answer-no">Almost!, we're getting there.</span>
      <span class="progress">
        {{data.percent}}% of the way there.
        {{data.finished}}
        of
        {{data.total}}
        tasks finished.
      </span>
    </h1>

    <ExternalLink href="https://github.com/NullVoxPopuli/is-polaris-ready-yet/">
      Contribute!
    </ExternalLink>

  {{/let}}
</template>;

GitHub messes up on the quote here, but there is a PR to linguist for that, I think.