render a simple captive portal in each language reusing butter styles

captive.html

@@ -0,0 +1,20 @@
+---
+layout: basic
+---
+
+{% assign page_data = site.data.home %}
+
+<section class="content-area" style="height: 100vh; padding-top: 40px;">
+  <div class="container">
+    <div class="content-area-wrapper text-center">
+      <img src="{{site.baseurl}}{{ page_data.page_logo[0] }}" alt="{{ page_data.page_logo[1] }}" />
+      <h1 class="content-title mb-2">{{ page_data.captive_data.welcome_message }}</h1>
+      <!-- Use NoDogSplash-provided variables to render a "continue" button -->
+      <form method="get" action="$authaction">
+        <input type="hidden" name="tok" value="$tok">
+        <input type="hidden" name="redir" value="$redir">
+        <input type="submit" value="{{ page_data.captive_data.continue_button }}">
+      </form>
+    </div>
+  </div>
+</section>