Translate
Represents a language used for translation. The interface allows for flexibility in defining translation languages, accommodating both specific language codes (e.g., "en-US", "ru-RU") and special cases like "auto" for automatic language detection.
This interface was created to handle situations where different APIs might have different requirements:
Some translation APIs accept a literal language code (e.g., "en-US" for English, "ru-ru" for Russian).
Other APIs, such as those that perform auto-detection, may use "auto" as a special keyword.
The sealed interface structure ensures that only known and valid translation languages are used, while allowing easy extension in the future if new language types are required.
By using an interface, we can define both special language cases (like Auto) and general language codes (represented by Literal) in a type-safe and scalable manner.