Rename everything HostingSignup -> EMSElementPro

This setup flow ended up quite specific due to all the various moving parts.

src/components/views/dialogs/EMSElementProDataConfirmDialog.tsx

@@ -0,0 +1,45 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+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 QuestionDialog from './QuestionDialog';
+import { _t } from "../../../languageHandler";
+import { IDialogProps } from "./IDialogProps";
+
+interface IProps extends IDialogProps {
+    onFinished(): void;
+}
+
+interface IState {}
+
+/*
+ * A dialog for confirming transfer of data to the Element Pro iframe.
+ */
+export default class EMSElementProDataConfirmDialog extends React.PureComponent<IProps, IState> {
+    public render() {
+        return (
+            <QuestionDialog
+                onFinished={this.props.onFinished}
+                title={_t("Confirm Account Data Transfer")}
+                description={
+                    "Please accept transfer of data to the Element Pro setup wizard to continue. The setup wizard" +
+                    "will be able to access your account for the duration of the setup process."
+                }
+                button={_t("Accept")}
+            />
+        );
+    }
+}