Craft Language Switcher

<li class="btn-group">
  <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    {{ craft.i18n.getLocaleById(craft.locale).name }} <span class="caret"></span>
  </button>
  {# Configure and loop through selected site locales #}
  {% set locales = ['en', 'da'] %}
  {% for locale in locales %}
      {% if loop.first %}<ul class="dropdown-menu lggnav">{% endif %}
      {% set current = false %}
      {# Check if locale equals the requested page locale #}
      {% if locale == craft.locale %}
          {% set current = true %}
      {% endif %}

      {# Is this an entry page? #}
      {% if entry is defined %}

          {# Find the current entry in the other locale #}
          {% set localeEntry = craft.entries.id(entry.id).locale(locale).first() %}

          {# Make sure that it's actually localized to this locale #}
          {% if localeEntry and localeEntry.locale == locale %}

              {# Output a link to it #}
              {% if locale != craft.locale %}
              <li class="nav-link{{ current ? ' current'}}"><a href="{{ localeEntry.getUrl() }}" class="nav-link{{ current ? ' current'}}">{{ craft.i18n.getLocaleById(locale).name }}</a></li>
              {% endif %}
          {% else %}

              {# Output a link to the homepage #}
              {% if locale != craft.locale %}
              <li class="nav-link{{ current ? ' current'}}"><a href="{{ craft.config.siteUrl[locale] }}" class="nav-link{{ current ? ' current'}}">{{ craft.i18n.getLocaleById(locale).name }}</a></li>
              {% endif %}
          {% endif %}

      {# Not an entry page #}
      {% else %}

          {# Output the same path with the locale's base URL (`siteUrl`) #}
          {% if locale != craft.locale %}
          <li class="nav-link{{ current ? ' current'}}"><a href="{{ craft.config.siteUrl[locale] ~ craft.request.getPath() }}" class="nav-link{{ current ? ' current'}}">{{ craft.i18n.getLocaleById(locale).name }}</a></li>
          {% endif %}
      {% endif %}
    {% if loop.last %}</ul>{% endif %}
  {% endfor %}
  </li>