Improve string for leaving space in leave dialog

Doesn't leave subspaces either, but those are in Beta so we probably
shouldn't mention them for now so the user doesn't get confused

Signed-off-by: Ekaterina Gerasimova <ekaterinag@element.io>

src/components/views/dialogs/LeaveSpaceDialog.tsx

@@ -97,13 +97,13 @@ const LeaveRoomsPicker = ({ space, spaceChildren, roomsToLeave, setRoomsToLeave
             definitions={[
                 {
                     value: RoomsToLeave.None,
-                    label: _t("Don't leave any"),
+                    label: _t("Don't leave any rooms"),
                 }, {
                     value: RoomsToLeave.All,
-                    label: _t("Leave all rooms and spaces"),
+                    label: _t("Leave all rooms"),
                 }, {
                     value: RoomsToLeave.Specific,
-                    label: _t("Leave specific rooms and spaces"),
+                    label: _t("Leave some rooms"),
                 },
             ]}
         />
@@ -166,11 +166,13 @@ const LeaveSpaceDialog: React.FC<IProps> = ({ space, onFinished }) => {
     >
         <div className="mx_Dialog_content" id="mx_LeaveSpaceDialog">
             <p>
-                { _t("Are you sure you want to leave <spaceName/>?", {}, {
+                { _t("You are about to leave <spaceName/>.", {}, {
                     spaceName: () => <b>{ space.name }</b>,
                 }) }
                 &nbsp;
                 { rejoinWarning }
+                { rejoinWarning && (<>&nbsp;</>) }
+                { spaceChildren.length > 0 && _t("Would you like to leave the rooms in this space?") }
             </p>
 
             { spaceChildren.length > 0 && <LeaveRoomsPicker