Part-DB.Part-DB-server/templates/_navbar.html.twig

<nav class="navbar navbar-expand-md navbar-light bg-light border-bottom shadow-sm fixed-top py-0" id="navbar">

    <button type="button" class="navbar-toggler" data-toggle="collapse" data-target="#sidebar-container">
        <span class="sr-only">{% trans %}sidebar.toggle{% endtrans %}</span>
        <!-- <span class="navbar-toggler-icon"></span> -->
        <i class="fas fa-folder-open fa-lg fa-fw"></i>
    </button>

    <a class="navbar-brand" href="{{ path('homepage') }}"><i class="fa fa-microchip" aria-hidden="true"></i> {{ partdb_title }}</a>

    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarContent" aria-controls="navbarContent" aria-expanded="false" aria-label="Toggle navigation">
        <!-- <span class="navbar-toggler-icon"></span> -->
        <i class="fas fa-bars  fa-lg"></i>
    </button>



    <div class="collapse navbar-collapse" id="navbarContent">
        <div class="form-inline my-2 my-lg-0 ml-auto" id="searchbar">
            <!-- Searchbar -->
            {% include "_navbar_search.html.twig" %}
        </div>

        <a class="d-block d-md-none  nav-link link-datasheet" style="color: black;"
           href="zxing://scan/?ret={if isset($smarty.server.HTTPS)}https{else}http{/if}%3A%2F%2F{$smarty.server.HTTP_HOST|escape:'url'}{$relative_path|escape:'url'}show_search_parts.php%3Fkeyword%3D%7BCODE%7D&SCAN_FORMATS=EAN_8,CODE_39">
            <i class="fa fa-barcode fa-fw fa-lg" aria-hidden="true"></i>
            <span class="ml-2 text-muted">{% trans %}barcode.scan{% endtrans %}</span>
        </a>

        <ul class="navbar-nav ml-3" id="login-content">
            <li class="nav-item dropdown">
                <a href="#" class="dropdown-toggle link-anchor nav-link" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
                    {% if app.user %}<i class="fa fa-user" aria-hidden="true"></i>{% else %}<i class="far fa-user" aria-hidden="true"></i>{% endif %} <span class="caret"></span></a>
                <ul class="dropdown-menu dropdown-menu-right" id="login-menu">
                    {% if app.user %}
                        <a class="dropdown-item disabled" href="#" >{% trans %}user.loggedin.label{% endtrans %} {{ app.user.firstName }} {{app.user.lastName}} ({{app.user.name}})</a>
                        <a class="dropdown-item" href="{{ path("user_settings") }}"><i class="fa fa-cogs fa-fw" aria-hidden="true"></i> {% trans %}user.settings.label{% endtrans %}</a>
                        <a class="dropdown-item" href="{{ path("user_info_self") }}"><i class="fa fa-info-circle fa-fw" aria-hidden="true"></i> {% trans %}user.info.label{% endtrans %}</a>
                        <li role="separator" class="dropdown-divider"></li>
                        <a class="dropdown-item"  href="{{ path('logout') }}"><i class="fa fa-sign-out-alt fa-fw" aria-hidden="true"></i> {% trans %}user.logout{% endtrans %}</a>
                    {% else %}
                        <a class="dropdown-item" href="{{ path('login', {'_target_path': app.request.pathinfo | loginPath}) }}" id="login-link"><i class="fa fa-sign-in-alt fa-fw" aria-hidden="true"></i> {% trans %}user.login{% endtrans %}</a>
                    {% endif %}
                    <li role="separator" class="dropdown-divider" id="toggleDarkmodeSeparator" hidden></li>
                    <div class="px-4 px-3" id="toggleDarkmodeContainer" hidden>
                        <div class="custom-control custom-switch">
                            <input type="checkbox" class="custom-control-input" id="toggleDarkmode">
                            <label class="custom-control-label" for="toggleDarkmode">{% trans %}ui.toggle_darkmode{% endtrans %}</label>
                        </div>
                    </div>
                    <li role="separator" class="dropdown-divider"></li>
                    <h6 class="dropdown-header">{% trans %}user.language_select{% endtrans %}</h6>
                    <a class="dropdown-item" data-no-ajax href="{{ path(app.request.attributes.get('_route'),
                        app.request.attributes.get('_route_params')|merge({'_locale': 'en'})) }}">
                        {% trans %}language.english{% endtrans %}</a>
                    <a class="dropdown-item" data-no-ajax href="{{ path(app.request.attributes.get('_route'),
                        app.request.attributes.get('_route_params')|merge({'_locale': 'de'})) }}">
                        {% trans %}language.german{% endtrans %}</a>
                </ul>
            </li>
        </ul>
    </div>
</nav>