{% load i18n %}
<form action="{% url lfc_edit_portlet portletassigment_id %}"
      method="post">
    <h1 class="first-heading">
        {% trans 'Add new portlet' %}
    </h1>

    <div class="field">
        <div class="label">
            <label>{% trans 'Position' %}:</label>
        </div>

        <div>
            <input type="text"
                   name="position"
                   value="1">
        </div>
    </div>
    <div class="field">
        <div class="label">
            <label>{% trans 'Slot' %}:</label>
        </div>

        <div>
            <select name="slot">
                {% for slot in slots %}
                    <option {% if slot.selected %}selected="selected"{% endif %}value="{{ slot.id }}">
                        {{ slot.name }}
                    </option>
                {% endfor %}
            </select>
        </div>
    </div>

    {% include "lfc/manage/lfc_form.html" %}

    <div class="buttons">
        <input type="hidden"
               name="portlet_type"
               value="{{ portlet_type }}" />

        <input class="ajax-portlet-save-button"
               type="submit"
               value="{% trans 'Save portlet' %}" />
    </div>
</form>

{% load i18n %}
<form action="{% url lfc_edit_portlet portletassigment_id %}"
      method="post">
    <h1 class="first-heading">
        {% trans 'Edit portlet' %}
    </h1>

    <div class="field">
        <div class="label">
            <label>{% trans 'Position' %}:</label>
        </div>

        <div>
            <input type="text"
                   name="position"
                   value="1">
        </div>
    </div>
    <div class="field">
        <div class="label">
            <label>{% trans 'Slot' %}:</label>
        </div>

        <div>
            <select name="slot">
                {% for slot in slots %}
                    <option {% if slot.selected %}selected="selected"{% endif %}value="{{ slot.id }}">
                        {{ slot.name }}
                    </option>
                {% endfor %}
            </select>
        </div>
    </div>

    {% include "lfc/manage/lfc_form.html" %}

    <div class="buttons">
        <input type="hidden"
               name="portlet_type"
               value="{{ portlet_type }}" />

        <input class="ajax-portlet-save-button"
               type="submit"
               value="{% trans 'Save portlet' %}" />
    </div>
</form>

Add new portlet -> Edit portlet
Typo: Add new portlet -> Edit portlet
