Missing translation for Bootstrap3 template

[oldskool]

When using the twitter_bootstrap3_translated template, an sr-only class is added to the current page with the content (current). This content is not translated into the various languages.

Example:

When I use this in my Twig template:

{{ pagerfanta(pager, 'twitter_bootstrap3_translated') }}

I get this HTML (my app uses Dutch locale settings):

<ul class="pagination">
    <li class="prev disabled"><span>← Vorige</span></li>
    <li class="active"><span>1 <span class="sr-only">(current)</span></span></li>
    <li><a href="/action/?page=2">2</a></li>
    <li class="next"><a href="/action/?page=2">Volgende →</a></li>
</ul>

As you can see the (current) bit is not translated.