add language keys

src/Umbraco.Web.UI.Client/src/assets/lang/da-dk.ts

@@ -1013,6 +1013,10 @@ export default {
 		lockoutWillOccur: 'Du har været inaktiv, og du vil blive logget ud om',
 		renewSession: 'Forny for at gemme dine ændringer',
 	},
+	login: {
+		instruction: 'Log ind på Umbraco',
+		signInWith: 'Log ind med {0}',
+	},
 	main: {
 		dashboard: 'Skrivebord',
 		sections: 'Sektioner',

src/Umbraco.Web.UI.Client/src/assets/lang/en-us.ts

@@ -1010,6 +1010,10 @@ export default {
 		lockoutWillOccur: "You've been idle and logout will automatically occur in",
 		renewSession: 'Renew now to save your work',
 	},
+	login: {
+		instruction: 'Sign in to Umbraco',
+		signInWith: 'Sign in with {0}',
+	},
 	main: {
 		dashboard: 'Dashboard',
 		sections: 'Sections',