Remove subtext in room invite dialog

The subtext here was deemed redundant.

Part of https://github.com/vector-im/riot-web/issues/10619

src/RoomInvite.js

@@ -68,7 +68,6 @@ export function showRoomInviteDialog(roomId) {
 
     Modal.createTrackedDialog('Chat Invite', '', AddressPickerDialog, {
         title: _t('Invite new room members'),
-        description: _t('Who would you like to add to this room?'),
         button: _t('Send Invites'),
         placeholder: _t("Email, name or Matrix ID"),
         validAddressTypes,

src/components/views/dialogs/AddressPickerDialog.js

@@ -577,6 +577,13 @@ module.exports = createReactClass({
         const AddressSelector = sdk.getComponent("elements.AddressSelector");
         this.scrollElement = null;
 
+        let inputLabel;
+        if (this.props.description) {
+            inputLabel = <div className="mx_AddressPickerDialog_label">
+                <label htmlFor="textinput">{this.props.description}</label>
+            </div>;
+        }
+
         const query = [];
         // create the invite list
         if (this.state.selectedList.length > 0) {
@@ -640,9 +647,7 @@ module.exports = createReactClass({
         return (
             <BaseDialog className="mx_AddressPickerDialog" onKeyDown={this.onKeyDown}
                 onFinished={this.props.onFinished} title={this.props.title}>
-                <div className="mx_AddressPickerDialog_label">
+                {inputLabel}
-                    <label htmlFor="textinput">{ this.props.description }</label>
-                </div>
                 <div className="mx_Dialog_content">
                     <div className="mx_AddressPickerDialog_inputContainer">{ query }</div>
                     { error }

src/i18n/strings/en_EN.json

@@ -117,7 +117,6 @@
     "Email, name or Matrix ID": "Email, name or Matrix ID",
     "Start Chat": "Start Chat",
     "Invite new room members": "Invite new room members",
-    "Who would you like to add to this room?": "Who would you like to add to this room?",
     "Send Invites": "Send Invites",
     "Failed to start chat": "Failed to start chat",
     "Operation failed": "Operation failed",