Use translation language, not country

Passepartout-iOS/Scenes/About/CreditsViewController.swift

@@ -137,7 +137,7 @@ extension CreditsViewController {
             guard let author = AppConstants.Translations.authorByLanguage[lang] else {
                 fatalError("Author not found for language \(lang)")
             }
-            cell.leftText = Utils.localizedCountry(lang)
+            cell.leftText = Utils.localizedLanguage(lang)
             cell.rightText = author
             cell.accessoryType = .none
             cell.isTappable = false

Passepartout/Sources/Utils.swift

@@ -138,6 +138,10 @@ public class Utils {
         return String(format: format, locale: Locale.current)
     }
 
+    public static func localizedLanguage(_ code: String) -> String? {
+        return Locale.current.localizedString(forLanguageCode: code)
+    }
+    
     private init() {
     }
 }