LanguageBuilder constructor Null safety

1. wings_data_model
2. wings_data_model
3. LanguageBuilder
4. LanguageBuilder constructor

LanguageBuilder class

1. Constructors
2. LanguageBuilder
3. Properties
4. hashCode
5. id
6. isoCode
7. name
8. runtimeType
9. Methods
10. build
11. noSuchMethod
12. replace
13. toString
14. update
15. Operators
16. operator ==