$form
$form : \TbActiveForm
## A Base class of all Input Widgets
$form : \TbActiveForm
setLocaleSettings()
### .setLocaleSettings()
If user did not provided the names of weekdays and months in $this->options['locale'] (which he should not care about anyway) then we populate this names from Yii's locales database.
This method works with the local properties directly, beware.