Update translation.json file with mail domain validation

Author: stephdl

ui/public/i18n/en/translation.json

@@ -141,7 +141,6 @@
     "delete_domain": "Delete domain",
     "delete_domain_confirm": "Delete domain <strong>{name}</strong>?",
     "delete_domain_explanation": "All associated email addresses will be deleted as well. However, all email messages received and sent by this domain will be preserved.",
-    "domain_pattern": "Invalid domain",
     "required_if_accept_unknown_recipients": "Required if \"Accept unknown recipients\" is enabled",
     "required_if_copy_inbound_messages": "Required if \"Copy inbound messages\" is enabled",
     "bccaddr_format": "Invalid email format",
@@ -155,7 +154,10 @@
     "configure_dkim_for_domain": "Configure DKIM for {domain}",
     "dkim_txt_record_description": "Create the TXT record required by DKIM at your <strong>{domain}</strong> DNS service provider by choosing <strong>one of the following procedures</strong>",
     "dkim_txt_record_key_procedure": "Set <strong>default._domainkey</strong> as record key and paste the record data",
-    "dkim_txt_record_raw_procedure": "Paste the full TXT record in raw form"
+    "dkim_txt_record_raw_procedure": "Paste the full TXT record in raw form",
+    "domain_pattern": "Must be a valid fully qualified domain name",
+    "domain_format": "Must be a valid fully qualified domain name",
+    "mail_domain_already_exists": "Domain already exists"
   },
   "addresses": {
     "title": "Addresses",