replace "Vignettes" with "Thumbnails"

Former-commit-id: 62545388cd93702e23e9df4001ec89b2d9ec168a

ippisite/ippidb/templates/compound_list.html

@@ -79,7 +79,7 @@
         </div>
         <span class="btn-group col-md-2">
             <a class="btn btn-default btn-outline-primary {% if display == 'v' %}active{% endif %}" href="#" {% if display != 'v' %}onclick="modifyUrl('display', 'v')"{% endif %}>
-                <i class="fa fa-th" title="Vignettes"></i>
+                <i class="fa fa-th" title="Thumbnails"></i>
             </a>
             <a class="btn btn-default btn-outline-primary {% if display == 'l' %}active{% endif %}" href="#" {% if display != 'l' %}onclick="modifyUrl('display', 'l')"{% endif %}>
                 <i class="fa fa-bars" title="List"></i>