1312: Implement initial vocabulary browsing mechanism

Task-Url: https://pm.winseda.de/issues/1312

js/search/search.responseHandler.js

@@ -95,9 +95,9 @@ ResponseHandler.prototype.processFilters = function(filters) {
 					classes += " selected";
 				}
 				ul.append(	"<li " + (classes.length>0 ? "class='" + classes + "'" : "") + ">" +
-								"<button class='btn btn-inline' onclick=\"search." + (selected ? 'removeFilterTerm' : 'addFilterTerm') + "('" + filters[i].label + "', '" + term.type + "', '" + term.term + "', this);\">" + 
+								"<span onclick=\"search." + (selected ? 'removeFilterTerm' : 'addFilterTerm') + "('" + filters[i].label + "', '" + term.type + "', '" + term.term + "', this);\">" + 
 									(selected ? "<i class=\"fas fa-times\"></i> " : "") + term.term + " (" + term.count + ")" +
-								"</button></li>");
+								"</span></li>");
 				
 			}