Adds link confirmation modal

bookwyrm/templates/book/link_verification_modal.html

@@ -0,0 +1,22 @@
+{% extends 'components/modal.html' %}
+{% load i18n %}
+
+{% block modal-title %}
+{% trans "Leaving BookWyrm" %}
+{% endblock %}
+
+
+{% block modal-body %}
+
+{% blocktrans trimmed with link_url=link.url %}
+This link is taking you to <code>{{ link_url }}</code>. Is that where you'd like to go?
+{% endblocktrans %}
+
+{% endblock %}
+
+
+{% block modal-footer %}
+<a href="{{ link.url }}" target="_blank" rel="noopener" class="button is-primary">{% trans "Continue" %}</a>
+<button type="button" class="button" data-modal-close>{% trans "Cancel" %}</button>
+
+{% endblock %}