Add duplicate domain warning

src/nginxconfig/i18n/en/templates/domain_sections/server.js

@@ -28,6 +28,8 @@ export default {
     domain: 'Domain',
     path: 'Path',
     documentRoot: 'Document root',
+    oneOrMoreOtherDomainsAreAlsoNamed: 'One or more other domains are also named',
+    thisWillCauseIssuesWithConfigGeneration: 'This will cause issues with config generation.',
     wwwSubdomain: 'www subdomain',
     cdnSubdomain: 'CDN subdomain',
     redirectSubdomains: 'Redirect subdomains',