Convert GenericErrorPage to TS

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/components/structures/GenericErrorPage.tsx

@@ -0,0 +1,35 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import { replaceableComponent } from "../../utils/replaceableComponent";
+
+interface IProps {
+    title: JSX.Element;
+    message: JSX.Element;
+}
+
+@replaceableComponent("structures.GenericErrorPage")
+export default class GenericErrorPage extends React.PureComponent<IProps> {
+    render() {
+        return <div className='mx_GenericErrorPage'>
+            <div className='mx_GenericErrorPage_box'>
+                <h1>{ this.props.title }</h1>
+                <p>{ this.props.message }</p>
+            </div>
+        </div>;
+    }
+}