Save selected language after close.

[OMSmolina]

By default every time I visit the website I get the locale from where I am but if I change it, it's not saved for the next time.

[niden]

We don't actually store any cookies to keep the language setting for a subsequent visit. The language is calculated from the actual request, unless specifically passed.

https://github.com/phalcon/website/blob/master/app/library/Traits/LanguageTrait.php#L22

You are more than welcome to create a PR to add this enhancement :)