Move invalidDomain entry to the correct area.

src/Umbraco.Web.UI/umbraco/config/lang/en.xml

@@ -6,7 +6,6 @@
   </creator>
   <area alias="actions">
     <key alias="assignDomain">Manage hostnames</key>
-    <key alias="invalidDomain">This is not a valid hostname</key>
     <key alias="auditTrail">Audit Trail</key>
     <key alias="browse">Browse Node</key>
     <key alias="copy">Copy</key>
@@ -37,6 +36,7 @@
   </area>
   <area alias="assignDomain">
     <key alias="addNew">Add new Domain</key>
+    <key alias="invalidDomain">This is not a valid hostname</key>   
     <key alias="domain">Domain</key>
     <key alias="domainCreated">New domain '%0%' has been created</key>
     <key alias="domainDeleted">Domain '%0%' is deleted</key>