bulma: message edition + extra menu + improvments: - add an extra menu template with `Edit` and `Quote` - add a template for previous editions popup - fix `own_msg` class application - add CSS for edit mode - cosmetic changes

{% 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 %}