Deprecated 'collection' parameter in favor of 'cq' - fixes #92

Change-Id: I51f0197da3a182fc4d4cd35f12ccb88cce3f8833
diff --git a/templates/partial/header.html.ep b/templates/partial/header.html.ep
index 8992b0f..8638d7b 100644
--- a/templates/partial/header.html.ep
+++ b/templates/partial/header.html.ep
@@ -9,11 +9,11 @@
       <button type="submit" id="qsubmit" title="<%= loc 'go' %>"><span><%= loc 'go' %></span></button>
     </div>
 
-    <!-- Search in the following virtual collection -->
+    <!-- Search in the following virtual corpus -->
     <div id="vc-view"></div>
     <%= loc 'in' %>
     %# TODO: Create 'align' parameter
-    %= text_field 'collection', id => 'collection'
+    %= text_field 'cq', id => 'cq'
 
     <%= loc 'with' %>
     <span class="select">