message: add all props to proptypes
diff: @@ -15,7 +15,6 @@ See the License for the specific language governing permissions and
  limitations under the License.
  */
  import React from 'react';
  -import {_t} from '../../../languageHandler';
  import PropTypes from 'prop-types';
  import dis from '../../../dispatcher';
  import EditorModel from '../../../editor/model';
  @@ -33,6 +32,9 @@ export default class BasicMessageEditor extends React.Component {
  static propTypes = {
  model: PropTypes.instanceOf(EditorModel).isRequired,
  room: PropTypes.instanceOf(Room).isRequired,
  + placeholder: PropTypes.string,
  + label: PropTypes.string, // the aria label
  + initialCaret: PropTypes.object, // See DocumentPosition in editor/model.js
  };
  constructor(props, context) {
  