Update messages.json

small change but updated the year in the footer. maybe there's a better way to grab the date with a function?

frontend/js/i18n/messages.json

@@ -60,7 +60,7 @@
     },
     "footer": {
       "fork-me": "Fork me on Github",
-      "copy": "&copy; 2019 <a href=\"{url}\" target=\"_blank\">jc21.com</a>.",
+      "copy": "&copy; 2021 <a href=\"{url}\" target=\"_blank\">jc21.com</a>.",
       "theme": "Theme by <a href=\"{url}\" target=\"_blank\">Tabler</a>"
     },
     "dashboard": {