For get Localization String By Language Code

Localization.swift

import Foundation

class Localization {
    static let instance: Localization = Localization()
    
    func getLocalizationBy(langCode: String, key: String) -> String? {
        guard let path = NSBundle.mainBundle().pathForResource(langCode, ofType: "lproj") else { return nil }
        let bundle = NSBundle(path: path)
        return bundle?.localizedStringForKey(key, value: nil, table: nil)
    }
}