Fix close button syntx for save instructions

core/messages/SaveInstructions.tid

@@ -1,7 +1,7 @@
 title: $:/messages/SaveInstructions
 type: text/vnd.tiddlywiki
 subtitle: Save your work
-footer: <<button close class:"btn btn-primary"><Close>>
+footer: <$button message="tw-close-tiddler" class="btn btn-primary">Close</$button>
 help: http://five.tiddlywiki.com/#help:SavingChanges
 
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