iOS Localization Advices (Swift 5). Article link: http://www.popcornomnom.com/ios-localization-swift-5/

Localizable.swift

enum Localizable {

    enum Global: String, LocalizableDelegate {
        case cancel, close
    }

    enum WelcomePage: String, LocalizableDelegate {
        case title = "welcomeTitle"
        case ctaButtonTitle = "start"
        case next
        case cancel = "close"
	}

    enum InApp: String, LocalizableDelegate {
        case title = "inAppTitle"
        case subtitle = "inAppSubtitle"
        case description = "inAppDescription"

        var table: String? {
            return "InApps"
        }
    }
}