1. translator api

2. translator api: `availability()` static method

3. translator api: `create()` static method

4. translator api: `destroy()` instance method

5. translator api: `inputquota` property

6. translator api: `measureinputusage()` instance method

7. translator api: `sourcelanguage` property

8. translator api: `targetlanguage` property

9. translator api: `translate()` instance method

10. translator api: `translatestreaming()` instance method