Localizing with Xcode 9

Strings Management
// Set a label's text
label.text = "Population"
// Set a label's text to a localized string
label.text = NSLocalizedString("Population", comment: "Label preceding the population value")
// Load localized string from a specific table

 label.text = NSLocalizedString("Population", tableName: nil, bundle: .main, value: "Localizable", comment: "Label preceding the population value")
 // Create a formatted string
 let format = NSLocalizedString("%d popular languages", comment:
     "Number of popular languages")
 label.text = String.localizedStringWithFormat(format, 2)

Formatters
let formatter = DateFormatter()
formatter.dateStyle = .full
let str = formatter.string(from: Date())

Localization Process

Stringsdict File

Testing