Used to mark text for localization. Keys include the class using the text and the first 10 characters of the default text. Translators will thank you later.

Localizable.swift

import Foundation

/// Used to mark text for localization. Keys include the class using the text and the first 10 characters of the default text.
protocol Localizable {}

extension Localizable {

    static func localize(_ text: String) -> String {
        let caller = String(describing: Self.self)
        let prefixIndex = text.index(text.startIndex, offsetBy: min(15, text.count))
        let prefix = (text[..<prefixIndex]).replacingOccurrences(of: " ", with: "_")
        let key = "\(caller):\(prefix)"

        return NSLocalizedString(key, value: text, comment: "")
    }
}