feat: reset custom texts on IAM (#3160)

* fix: only show factors with state ready

* fix: get iam by id and clean up code

* fix: get iam by id and clean up code

* fix: remove unused code

* feat: add message template remove func to admin api

* fix: proto texts

* fix: proto texts

internal/command/custom_message_text_model.go

@@ -79,6 +79,16 @@ func (wm *CustomMessageTextReadModel) Reduce() error {
 				wm.FooterText = ""
 			}
 		case *policy.CustomTextTemplateRemovedEvent:
+			if wm.Language != e.Language {
+				continue
+			}
+			wm.Subject = ""
+			wm.Title = ""
+			wm.PreHeader = ""
+			wm.Text = ""
+			wm.Greeting = ""
+			wm.ButtonText = ""
+			wm.FooterText = ""
 			wm.State = domain.PolicyStateRemoved
 		}
 	}