flask-json-dream-website/templates/navbar.html

<nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
    <a class="navbar-brand" href="#"></a>

    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar"
      aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbar">

      <!-- left side -->
      <ul class="navbar-nav mr-auto">

        <li class="nav-item">
          <a class="nav-link" href="/">Home</a>
        </li>

        {% for ndl in conf["NAVBAR_DROPDOWN_LINKS"] %}
	<li class="nav-item nav-link dropdown">
		<button class="dropdown-toggle" type="button" 
		  style="background: rgba(0,0,0,0);color: azure !important;border: rgba(0,0,0,0);"
		  id="dropdown-{{ ndl['name'] }}" data-toggle="dropdown" 
		  aria-haspopup="true" aria-expanded="false">
		{{ ndl["name"] }}
	  </button>
	  <div class="dropdown-menu mt-0 bg-dark" aria-labelledby="dropdown-{{ ndl['name'] }}">
              {% for link in ndl["links"] %}
	      <a class="dropdown-item nav-link hover-to-75" href="{{ link['href'] }}">{{ link["name"] }}</a>
	      {% endfor %}
	  </div>
	</li>
        {% endfor %}

        {% for nl in conf["NAVBAR_LINKS"] %}
        <li class="nav-item">
            <a class=nav-link href="{{ nl[1] }}">{{ nl[0] }}</a>
        </li>
        {% endfor %}

        {% if conf["TEAMSPEAK_SERVER"] %}
        <li class="nav-item right">
          <a class="nav-link" href="ts3server://{{ conf['TEAMSPEAK_SERVER'] }}">Teamspeak</a>
        </li>
        {% endif %}
        
        {% if conf["DISCORD_SERVER"] %}
        <li class="nav-item right">
          <a class="nav-link" href="{{ conf['DISCORD_SERVER'] }}">Discord</a>
        </li>
        {% endif %}

      </ul>

      <!-- right side -->
      <ul class="navbar-nav">

        {% for nl in conf["NAVBAR_LINKS_RIGHT"] %}
        <li class="nav-item float-right">
            <a class="nav-link" href="{{ nl[1] }}">{{ nl[0] }}</a>
        </li>
        {% endfor %}
        
        {% if conf["INSTAGRAM"] %}
        <li class="nav-item right">
          <a class="nav-link" href="{{ conf['INSTAGRAM'] }}">Instagram</a>
        </li>
        {% endif %}

        {% if conf["FACEBOOK"] %}
        <li class="nav-item right">
          <a class="nav-link" href="{{ conf['FACEBOOK'] }}">Facebook</a>
        </li>
        {% endif %}

        {% if conf["TWITTER"] %}
        <li>
          <a class="nav-link" href="{{ conf['TWITTER'] }}">Twitter</a>
        </li>
        {% endif %}

	{% if conf["LANGUAGE"] == "en" %}
        <li>
	  <a class="nav-link flag" href="/"
		  style="background-image: url('https://potaris.de/picture/lang/german-flag.png');">
		  DE
	  </a>
        </li>
	{% elif conf["LANGUAGE"] == "de" %}
        <li>
          <a class="nav-link flag" href="/en/"
		  style="background-image: url('https://potaris.de/picture/lang/uk-flag.png');">
		  EN
	  </a>
        </li>
	{% endif %}

      </ul>
      
    </div>
</nav>
<nav id="navbar-ph" class="navbar navbar-dark bg-dark fake">
  <li class="navbar-nav">
    <a class="nav-link" href="#">placeholder</a>
  </li>
</nav>