$ bower install gaia-components/gaia-headerIf choosing to use the built in action-button you may wish to localize the content within. You can do this by providing a specicial .l10n-action child node.
<gaia-header action="back">
<span class="l10n-action" aria-label="Back">Localized text</span>
<h1>title</h1>
</gaia-header>