Fix typo.

i18n/en.i18n.json

@@ -1097,5 +1097,5 @@
   "remove-btn": "Remove",
   "invite-people-success": "Invitation to register sent with success",
   "invite-people-error": "Error while sending invitation to register",
-  "can-invite-if-same-mailDomainName": "E-mail domain name"
+  "can-invite-if-same-mailDomainName": "Email domain name"
 }