message: Appease the prop types
diff: @@ -274,8 +274,8 @@ export default class AppearanceUserSettingsTab extends React.Component {
  type="text"
  label={_t("Font size")}
  autoComplete="off"
  - placeholder={this.state.fontSize}
  - value={this.state.fontSize}
  + placeholder={toString(this.state.fontSize)}
  + value={toString(this.state.fontSize)}
  id="font_size_field"
  onValidate={this._onValidateFontSize}
  onChange={({value}) => this.setState({fontSize: value})}
  