Adding `hu` localisation & fixing `fr`

[emri99]

Hello !

I would like to create a pull request for Hungarian locale. I've notice 1/2 mistakes in French translations.

Do you prefer 2 PR for each subject or one for both ?

(I will open PRs here and flutter_country_selector)

[cedvdb]

Hey, you can make one for localizations

[emri99]

• Fixed here in https://github.com/cedvdb/phone_form_field/pull/226
• Fixed on flutter_country_selector) in https://github.com/cedvdb/flutter_country_selector/pull/7