[Web] Add german translation for idp settings

data/web/lang/lang.en-gb.json

@@ -804,6 +804,9 @@
         "forgot_password": "> Forgot Password?",
         "invalid_pass_reset_token": "The reset password token is invalid or has expired.<br>Please request a new password reset link.",
         "login": "Login",
+        "login_user": "User Login",
+        "login_dadmin": "Domain-Administrator Login",
+        "login_admin": "Administrator Login",
         "mobileconfig_info": "Please login as mailbox user to download the requested Apple connection profile.",
         "new_password": "New Password",
         "new_password_confirm": "Confirm new password",