una/template/wiki_add_block.html

<div class="bx-wiki-add-block bx-def-margin-top bx-def-padding">
    <a href="javascript:void(0);" onclick="bx_wiki_add_block(this, '__page__', '__cell_id__', '__action_uri__')"><i class="sys-icon plus"></i> __add_block__</a>
</div>