Add label picker

source/Component/ErrorMessage/ErrorMessage.tsx

@@ -5,10 +5,11 @@ import "./ErrorMessage.scss";
 interface IErrorMessageProps {
     i18nKey: AllI18nKeys;
     options?: Record<string, string>;
+    className?: string;
 }
 
 const ErrorMessage: FunctionComponent<IErrorMessageProps> = (props) => {
-    return <div className="panel-error-message">
+    return <div className={["panel-error-message", props.className].filter(c => !!c).join(" ")}>
         <Localization i18nKey={props.i18nKey} options={props.options}/>
     </div>
 }