bulma (file, components): fix color fo icons: icons have no color specified anymore for a while, and use the color of parent elements. As they are often used in a `<a>` element (to work without javascript), they are often using a link color. This commit change a few icons to use a dark color instead.

{% if not embedded %}{% extends 'base/base.html' %}{% endif %}
{% block body_wrapper %}
    <iframe class="embed" src="{{target_url}}"></iframe>
{% endblock body_wrapper  %}

{% block footer %}{% endblock footer %}