Add text color classes

web/app/templates/services/corpus_analysis.html.j2

@@ -10,7 +10,7 @@
 <div class="col s12 m3 push-m9">
   <div class="center-align">
     <a class="btn-floating btn-large waves-effect waves-light" style="transform: scale(2);">
-      <i class="material-icons service" data-service="corpus_analysis"></i>
+      <i class="material-icons service" data-service="corpus-analysis"></i>
     </a>
   </div>
 </div>