api/pluralization library

1. slang package
2. documentation
3. api/pluralization.dart

slang package

1. Libraries
2. api/locale
3. api/pluralization
4. api/secret
5. api/singleton
6. api/state
7. api/translation_overrides
8. builder/builder/build_model_config_builder
9. builder/builder/generate_config_builder
10. builder/builder/raw_config_builder
11. builder/builder/slang_file_collection_builder
12. builder/builder/translation_map_builder
13. builder/builder/translation_model_builder
14. builder/builder/translation_model_list_builder
15. builder/model/build_model_config
16. builder/model/build_result
17. builder/model/context_type
18. builder/model/enums
19. builder/model/generate_config
20. builder/model/i18n_data
21. builder/model/i18n_locale
22. builder/model/interface
23. builder/model/node
24. builder/model/obfuscation_config
25. builder/model/pluralization
26. builder/model/raw_config
27. builder/model/slang_file_collection
28. builder/model/translation_map
29. slang