You can easy add a prefix text to all submenu output by overwrite the template:

  1. goto "django admin site"
  2. add a new "template" item (under "Dbtemplates")
  3. create a template with the name sub_menu/sub_menu.html:

example:

HTML+Django/Jinja
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{% extends "pylucid/css_anchor_div.html" %}

{% block plugin_content %}
<p>
    {% ifequal page_language "de" %}Die folgenden Unterseiten sind verfügbar:{% endifequal %}
    {% ifequal page_language "en" %}The following sub pages are available:{% endifequal %}
</p>
<ul>
{% for page in sub_pages %}
  <li><a href="{{ page.get_absolute_url }}" hreflang="{{ page.language.code }}" title="{{ page.get_title }}">{{ page.get_name }}</a></li>
{% endfor %}
</ul>
{% endblock %}

Only the lines 4-7 was added.

The original template is stored here:
pylucid_project/pylucid_plugins/sub_menu/templates/sub_menu/sub_menu.html