```html
<!-- ACP page template for ConfigSave -->
<!-- Basic UI: list extensions, export selected, import JSON file -->
<h1>{{ lang('ACP_CONFIGSAVE') }}</h1>

<form id="export_form" method="post" action="{{ U_ACTION }}">
	<fieldset>
		<legend>{{ lang('EXPORT_SETTINGS') }}</legend>
		<dl>
			<dt><label for="extension">{{ lang('SELECT_EXTENSION') }}</label></dt>
			<dd>
				<select name="extension" id="extension">
					{% for extensions in loops.extensions %}
						<option value="{{ extensions.KEY }}">{{ extensions.VENDOR }}/{{ extensions.EXTENSION }} {{ lang('ENABLED') }}: {{ extensions.ENABLED }}</option>
					{% endfor %}
				</select>
			</dd>
		</dl>
		<p class="submit-buttons">
			<input type="submit" name="export" value="{{ lang('EXPORT') }}" />
			<input type="hidden" name="action" value="export" />
		</p>
	</fieldset>
</form>

<form id="import_form" method="post" action="{{ U_ACTION }}" enctype="multipart/form-data">
	<fieldset>
		<legend>{{ lang('IMPORT_SETTINGS') }}</legend>
		<dl>
			<dt><label for="import_file">{{ lang('IMPORT_FILE') }}</label></dt>
			<dd><input type="file" name="import_file" id="import_file" accept=".json" /></dd>
		</dl>
		<p class="submit-buttons">
			<input type="submit" name="import" value="{{ lang('IMPORT') }}" />
			<input type="hidden" name="action" value="import" />
		</p>
	</fieldset>
</form>
```