<div class="btn-group navbar-btn mr-0" role="group"> <button id="btnGroupDrop1" type="button" class="btn btn-transparent dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span class="d-none d-sm-inline-block">{{ 'lang'|trans }}</span> <img src="{{ asset('build/'~app.request.locale~'.svg') }}" class="navbar-btn__flag" alt="Flag"/> </button> {% set params = app.request.attributes.get('_route_params')|merge(app.request.query.all) %} <div class="dropdown-menu" aria-labelledby="btnGroupDrop1"> <a class="dropdown-item" href="{{ url(app.request.get('_route'), params|merge({ _locale: 'en' })) }}"><img src="/assets/images/en.svg" class="navbar-btn__flag" alt="Flag"/> {{ 'lang.en'|trans }}</a> <a class="dropdown-item" href="{{ url(app.request.get('_route'), params|merge({ _locale: 'cs' })) }}"><img src="/assets/images/cs.svg" class="navbar-btn__flag" alt="Flag"/> {{ 'lang.cs'|trans }}</a> </div></div>