message: set placeholder same as label
diff: @@ -99,7 +99,7 @@ export default class SendMessageComposer extends React.Component {
  ref={this._setEditorRef}
  model={this.model}
  room={this.props.room}
  - label={_t("Send message")}
  + label={this.props.placeholder}
  placeholder={this.props.placeholder}
  />
  </div>
  