Update localization documentation

Sources/SwiftKit/Localization/BundleTranslator.swift

@@ -19,6 +19,9 @@ public class BundleTranslator: Translator {
     
     private let bundle: Bundle
     
+    /**
+     Translate the provided key to a localized string.
+     */
     public func translate(_ key: String) -> String {
         bundle.localizedString(forKey: key, value: "", table: nil)
     }

Sources/SwiftKit/Localization/LocalizationService.swift

@@ -16,6 +16,9 @@ import Foundation
  notifications when the app locale changes.
  */
 public protocol LocalizationService: Translator {
-        
+    
+    /**
+     Change the service's locale.
+     */
     func setLocale(_ locale: Locale) throws
 }

Sources/SwiftKit/Localization/StandardLocalizationService.swift

@@ -41,6 +41,9 @@ open class StandardLocalizationService: LocalizationService {
         case lprojFileDoesNotExist(for: Locale)
     }
     
+    /**
+     Change the service's locale.
+     */
     open func setLocale(_ locale: Locale) throws {
         guard let languageCode = locale.languageCode else { throw LocaleError.languageCodeIsMissing(for: locale) }
         guard loadBundle(for: languageCode) else { throw LocaleError.lprojFileDoesNotExist(for: locale) }
@@ -49,6 +52,9 @@ open class StandardLocalizationService: LocalizationService {
         notificationCenter.post(name: .localization(.localeDidChange), object: nil)
     }
     
+    /**
+     Translate the provided key to a localized string.
+     */
     open func translate(_ key: String) -> String {
         translator.translate(key)
     }

Sources/SwiftKit/Localization/StandardTranslator.swift

@@ -15,6 +15,9 @@ public class StandardTranslator: Translator {
     
     public init() {}
     
+    /**
+     Translate the provided key to a localized string.
+     */
     public func translate(_ key: String) -> String {
         NSLocalizedString(key, comment: "")
     }

Sources/SwiftKit/Localization/Translator.swift

@@ -14,5 +14,8 @@ import Foundation
  */
 public protocol Translator: AnyObject {
     
+    /**
+     Translate the provided key to a localized string.
+     */
     func translate(_ key: String) -> String
 }