<div class="navbar">
  <div class="container">
    <% if defined?(controls) && controls %>
      <div class="dropdown dropdown-dark">
        <select name="filter" class="dropdown-select">
          <option value="" selected>All languages</option>
          <% languages.each do |language| %>
            <option value=".lang-<%= language.downcase.gsub(/\s/, '-') %>">Only <%= language %></option>
          <% end %>
        </select>
      </div>
      <div class="dropdown dropdown-dark">
        <select name="sort" class="dropdown-select">
          <option value="stars" selected>Sorted by stars</option>
          <option value="forks">Sorted by forks</option>
          <option value="issues">Sorted by issues</option>
          <option value="title">Sorted by title</option>
        </select>
      </div>
    <% end %>

    <div class="right-menu">
      <ul>
        <li><a href="/about.html">About StaticGen</a></li>
        <li><a href="/rules.html">The Rules</a></li>
      </ul>
    </div>
  </div>
</div>

<div class="navbar">
  <div class="container">
    <% if defined?(controls) && controls %>
      <div class="dropdown dropdown-dark">
        <select name="filter" class="dropdown-select">
          <option value="" selected>All languages</option>
          <% languages.each do |language| %>
            <option value=".lang-<%= language.downcase.gsub(/\s/, '-') %>"><%= language %></option>
          <% end %>
        </select>
      </div>
      <div class="dropdown dropdown-dark">
        <select name="sort" class="dropdown-select">
          <option value="stars" selected>Sorted by stars</option>
          <option value="forks">Sorted by forks</option>
          <option value="issues">Sorted by issues</option>
          <option value="title">Sorted by title</option>
        </select>
      </div>
    <% end %>

    <div class="right-menu">
      <ul>
        <li><a href="/about.html">About StaticGen</a></li>
        <li><a href="/rules.html">The Rules</a></li>
      </ul>
    </div>
  </div>
</div>

Remove "only" from the dropdown
Remove "only" from the dropdown

Unless my rationale is wrong, the word _only_ makes it __harder__ to search for a language. Drop-downs are single-selection anyway, so it's obvious what the element stands for.