A good way to manage localized string with swift

LocalizableString.swift

extension String {
    func localized(tableName: String = "Localizable") -> String {
        return NSLocalizedString(self, tableName: tableName, value: "**\(self)**", comment: "")
    }
}

protocol Localizable {
    var tableName: String { get }
    var localized: String { get }
}

extension Localizable where Self: RawRepresentable, Self.RawValue == String {
    var localized: String {
        return rawValue.localized(tableName: tableName)
    }
}

enum LocalizableString: String, Localizable {

    /// Invalid request
    case invalid_request = "invalid_request"

    /// Unexpected error
    case unexpected_error = "unexpected_error"

    var tableName: String {
        return "Default"
    }
}

/// Default.strings file
/**
"invalid_request" = "Invalid request";
"unexpected_error" = "Unexpected error";
**/