String extension to localize strings with parameter support

StringExtensions.swift

extension String
{
    public static func localize(_ key: String, comment: String) -> String {
        return NSLocalizedString(key, comment: comment)
    }
    
    func format(parameters: CVarArg...) -> String {
        return String(format: self, arguments: parameters)
    }
}

// use
let helloWorld = String.localize("Hello world!", comment: "")

// use with parameters
let country = "Sweden"
let helloCountry = String.localize("Hello %@", comment: "").format(parameters: country!)

// add a script build-phase in xcode to export all strings to file for localization
# generate strings for swift files
find . -name "*.swift" ! -name "StringExtensions.swift" -print0 | xargs -0 genstrings -s localize -o "MyProj/Base.lproj"