Bugs fixes, Lint fixes, Refactoring

Sources/Strings/Twine/TwineOptions.swift

@@ -19,7 +19,7 @@ struct TwineOptions: ParsableArguments {
     var outputPath: String
     
     @Option(name: .customLong("langs"), help: "Langs to generate.")
-    var langsRaw: String
+    fileprivate var langsRaw: String
     
     @Option(help: "Default langs.")
     var defaultLang: String
@@ -27,3 +27,11 @@ struct TwineOptions: ParsableArguments {
     @Option(help: "Path where to generate the extension.", transform: { $0.replaceTiltWithHomeDirectoryPath() })
     var extensionOutputPath: String
 }
+
+extension TwineOptions {
+    var langs: [String] {
+        langsRaw
+            .split(separator: " ")
+            .map { String($0) }
+    }
+}