Лендинг Киоска, начал переводить форму обратного звонка на реакт

```coffee
formContent = switch @state.currentState
  when SHOW_STATE      then `<CallbackForm_OpenButton onClick={ this.onOpenForm } />`
  when OPEN_STATE      then `<CallbackForm_Form onCloseForm={ this.onCloseForm } />`
  when SUBMITTED_STATE then `<CallbackForm_Success />`
  else console.warn 'Unknown currentState of CallbackForm component', @state.currentState
```