Update textUpdate

Extensions/combined/_locales/en/messages.json

@@ -39,7 +39,7 @@
     "message": "Temporarily Unavailable"
   },
   "textUpdate": {
-    "message": "update to"
+    "message": "Update to"
   },
   "version30installed": {
     "message": "Version 3.0.0.1 installed"