[enh] displaying language_code in preferences

        <select name='language'>

            <option value="all" {% if current_language == 'all' %}selected="selected"{% endif %}>{{ _('Automatic') }}</option>

            {% for lang_id,lang_name,country_name in language_codes %}

            <option value={{ lang_id }} {% if lang_id == current_language %}selected="selected"{% endif %}>{{ lang_name}} ({{ country_name }})</option>

            <option value={{ lang_id }} {% if lang_id == current_language %}selected="selected"{% endif %}>{{ lang_name}} ({{ country_name }}) - {{ lang_id }}</option>

            {% endfor %}

        </select>

        </p>