Localization

[murraysagal]

Hello, we're localizing our app and we'd like to extend that to NYTPhotoViewer. It doesn't look like it would be much work, you're already using NSLocalizedString(). We could contribute to this effort. Are you interested?

[murraysagal]

@mr-fixit any interest in this?

[mr-fixit]

Please pardon my silence, I'm a bad multitasker.

I'd be happy to review a PR.