Long sentence cannot be translated as the sentence is sent over request query parameter, not request body.

[ynojima]

Since DeepL rejects too long request URL, long sentence need to be sent over a arequest body, but DeepL4J sends over request query parameter because OpenAPI generator doesn't support enconding.<property-name>.explode.
When OpenAPI generator supports it, it can be resolved by merging use-request-body branch.

[wombelix]

Might worth to mention the related Issue: OpenAPITools/openapi-generator#11256