#250 - Convenience for setting the document language

[reckart]

• Added get_document_annotation()
• Added document_language property
• Added test

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ef1d5f4) 95.13% compared to head (e2a8513) 95.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #304 +/- ## ========================================== + Coverage 95.13% 95.16% +0.03% ========================================== Files 5 5 Lines 1972 1987 +15 ========================================== + Hits 1876 1891 +15 Misses 96 96 ```

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