Adds copy to clarify how to delete a user as a moderator

bookwyrm/templates/user_admin/delete_user_form.html

@@ -8,8 +8,13 @@
 {% block form %}
 <form name="delete-user" action="{% url 'settings-delete-user' user.id %}" method="post">
     {% csrf_token %}
+    <p>
+        {% blocktrans trimmed with username=user.localname %}
+        Are you sure you want to delete <strong>{{ username}}</strong>'s account? This action cannot be undone. To proceed, please enter your password to confirm deletion.
+        {% endblocktrans %}
+    </p>
     <div class="field">
-        <label class="label" for="id_password">{% trans "Confirm password:" %}</label>
+        <label class="label" for="id_password">{% trans "Your password:" %}</label>
         <input class="input {% if form.password.errors %}is-danger{% endif %}" type="password" name="password" id="id_password" required>
         {% for error in form.password.errors %}
         <p class="help is-danger">{{ error | escape }}</p>