Fix typo in translation

frontend/public/locales/en/frontpage.json

 {
-  "description": "The Guest Service is for individuals who are not employed of student at {{inst}}, that need access to part of {{inst}}s IT-services. Choose log-in method below:",
+  "description": "The Guest Service is for individuals who are not employed or student at {{inst}}, that need access to part of {{inst}}s IT-services. Choose log-in method below:",
   "header": "Guest Service",
   "login": "Log in (FEIDE/ID-porten)",
   "sponsor": "Sponsor",
   "sponsorInfo": "Only for administration of guests.",
   "guest": "Guests",
   "guestInfo": "Only for guests. Access to registered personal information."
-}
+}
\ No newline at end of file