a11y adjustments for toasts

src/components/structures/ToastContainer.js

@@ -74,7 +74,7 @@ export default class ToastContainer extends React.Component {
         });
 
         return (
-            <div className={containerClasses}>
+            <div className={containerClasses} role="alert" aria-live="polite">
                 <div className={toastClasses}>
                     <h2>{title}{countIndicator}</h2>
                     <div className="mx_Toast_body">{React.createElement(component, toastProps)}</div>

src/components/views/toasts/VerificationRequestToast.js

@@ -108,7 +108,7 @@ export default class VerificationRequestToast extends React.PureComponent {
         }
         return (<div>
             <div className="mx_Toast_description">{nameLabel}</div>
-            <div className="mx_Toast_buttons">
+            <div className="mx_Toast_buttons" aria-live="off">
                 <FormButton label={_t("Decline (%(counter)s)", {counter: this.state.counter})} kind="danger" onClick={this.cancel} />
                 <FormButton label={_t("Accept")} onClick={this.accept} />
             </div>