* Displays the plugin installation page with available plugins.
     *
     * @return HTML response for the plugin installation page
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse installplugin() {
        saveToken();
        return asHtml(path_AdminPlugin_AdminPluginInstallpluginJsp).renderWith(data -> {
            final List<Map<String, String>> result = new ArrayList<>();