fix(orchestration): handle new jsii-docgen transliteration error (#1420)

Without this, orchestration will always fail loudly.

A `TransliterationError` is emitted by `jsii-docgen` when
transliteration by `jsii-rosetta` failed.
This always implies that all (sub-)modules for the given language will
fail, since the transliteration step is not submodule specific.

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