Support for showing flags with RTL languages

[hojatdelfan]

Fix #548.

There are ways to know the language from right to left, but some of them don't work. Detecting it using the "AppleLanguages" seems to work fine.

[bguidolim]

@hojideli using UIView.effectiveUserInterfaceLayoutDirection wouldn't be enough?

Source: https://developer.apple.com/documentation/uikit/uiview/1648536-effectiveuserinterfacelayoutdire

[hojatdelfan]

@bguidolim Using UIView.effectiveUserInterfaceLayoutDirection is not supported for iOS version 9. By using it, the view itself is used to detect, not the app language. I also used userInterfaceLayoutDirection, but they did not recognize the app language. Source: https://developer.apple.com/documentation/appkit/nsapplication/1428556-userinterfacelayoutdirection

Finally, I used NSLocale to recognize the language and that seems to work fine. Could you review it, please?

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