osr-discourse-src/app/assets/javascripts/discourse/templates/components/private-message-glyph.hbs

{{#if href}}
  <a href={{href}} title={{i18n title}} aria-label={{i18n ariaLabel}}>
    <span class="private-message-glyph-wrapper">
      {{d-icon "envelope" class="private-message-glyph"}}
    </span>
  </a>
{{else}}
  <span class="private-message-glyph-wrapper">
    {{d-icon "envelope" class="private-message-glyph"}}
  </span>
{{/if}}