MPS-19515 After first language generation there is no language descriptor file in language folder. LanguageModelDescriptor is read-only, and is not considered for first time generation. It seems to be not ModelGenerationStatusManager's responsibility to check model for being read-only, rather that of its clients, aware of a context.
Update generated files for language descriptors to reflect the fact Language Descriptor treated as 'generatable' now, despite the fact it's read-only.