Update `English` translation

Currently translated at 100.0% (123 of 123 strings)

Translation: Wiki-Bot/Dashboard
Translate-URL: https://translate.wikibot.de/projects/wiki-bot/dashboard/en/

dashboard/i18n/en.json

@@ -46,7 +46,7 @@
     },
     "notice": {
         "error": {
-            "text": "An unknown error occured, please try again.",
+            "text": "An unknown error occurred, please try again.",
             "title": "Unknown error!"
         },
         "invalidusergroup": {