app/components/layout/locale_switcher_component.html.erb
<div class="locale">
<% if many_locales? %>
<form class="locale-form">
<label class="inline-block" for="locale-switcher"><%= label %></label>
<select class="js-location-changer locale-switcher inline-block" name="locale-switcher" id="locale-switcher">
<%= options_for_select(language_options, current_path_with_query_params(locale: I18n.locale)) %>
</select>
</form>
<% else %>
<p id="<%= label_id %>"><%= label %></p>
<%= link_list(*language_links, "aria-labelledby": label_id) %>
<% end %>
</div>