ref(settings): convert panel to react

The goal is to reduce usage on atlassian/aui. New components
have been created to display the settings panel. Language
selection will reach into i18n for state whereas moderator
options will keep state in redux.

react/features/settings-menu/components/DeviceSelectionButton.web.js

@@ -0,0 +1,87 @@
+import Button from '@atlaskit/button';
+import PropTypes from 'prop-types';
+import React, { Component } from 'react';
+import { connect } from 'react-redux';
+
+import { translate } from '../../base/i18n';
+import { openDeviceSelectionDialog } from '../../device-selection';
+
+/**
+ * Implements a React {@link Component} which displays a button for opening the
+ * {@code DeviceSelectionDialog}.
+ *
+ * @extends Component
+ */
+class DeviceSelectionButton extends Component {
+    /**
+     * {@code DeviceSelectionButton} component's property types.
+     *
+     * @static
+     */
+    static propTypes = {
+        /**
+         * Invoked to display the {@code DeviceSelectionDialog}.
+         */
+        dispatch: PropTypes.func,
+
+        /**
+         * Whether or not the button's title should be displayed.
+         */
+        showTitle: PropTypes.bool,
+
+        /**
+         * Invoked to obtain translated strings.
+         */
+        t: PropTypes.func
+    };
+
+    /**
+     * Initializes a new {@code DeviceSelectionButton} instance.
+     *
+     * @param {Object} props - The read-only properties with which the new
+     * instance is to be initialized.
+     */
+    constructor(props) {
+        super(props);
+
+        // Bind event handler so it is only bound once for every instance.
+        this._onOpenDeviceSelectionDialog
+            = this._onOpenDeviceSelectionDialog.bind(this);
+    }
+
+    /**
+     * Implements React's {@link Component#render()}.
+     *
+     * @inheritdoc
+     * @returns {ReactElement}
+     */
+    render() {
+        return (
+            <div>
+                { this.props.showTitle
+                    ? <div className = 'subTitle'>
+                        { this.props.t('settings.audioVideo') }
+                    </div>
+                    : null }
+                <Button
+                    appearance = 'primary'
+                    onClick = { this._onOpenDeviceSelectionDialog }
+                    shouldFitContainer = { true }>
+                    { this.props.t('deviceSelection.deviceSettings') }
+                </Button>
+            </div>
+        );
+    }
+
+    /**
+     * Opens the {@code DeviceSelectionDialog}.
+     *
+     * @private
+     * @returns {void}
+     */
+    _onOpenDeviceSelectionDialog() {
+        this.props.dispatch(openDeviceSelectionDialog());
+    }
+}
+
+export default translate(connect()(DeviceSelectionButton));