Show Corpus status on corpus page.

app/templates/corpora/corpus.html.j2

@@ -4,6 +4,7 @@
 <div class="col s12 m4">
   <h3 id="title">{{ corpus.title }}</h3>
   <p id="description">{{ corpus.description }}</p>
+  <a class="waves-effect waves-light btn">{{ corpus.status }}</a>
 </div>
 
 <div class="col s12 m8">