[IMP] web: better copy for adding a column in kanban views

addons/web/static/src/xml/kanban.xml

@@ -45,7 +45,7 @@
     <div class="o_column_quick_create">
         <div class="o_quick_create_folded">
             <span class="o_kanban_add_column"><i class="fa fa-plus"/></span>
-            <span class="o_kanban_title">Add a new Column</span>
+            <span class="o_kanban_title">Add a Column</span>
         </div>
         <div class="o_quick_create_unfolded">
             <div class="o_kanban_header">