message: Fix copy '!'
diff: @@ -287,7 +287,7 @@ export default class AppearanceUserSettingsTab extends React.Component<IProps, I
  <span className="mx_SettingsTab_subheading">{_t("Font size")}</span>
  <MessagePreview
  className="mx_AppearanceUserSettingsTab_fontSlider_preview"
  - message="Hey you. You're the best"
  + message="Hey you. You're the best!"
  />
  <div className="mx_AppearanceUserSettingsTab_fontSlider">
  <div className="mx_AppearanceUserSettingsTab_fontSlider_smallText">Aa</div>
  