PEP8 Style Fixes for test_language.py

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Description

This pull request includes PEP8 style fixes for the test_language.py file.

Summary

• PEP8 style fixes for test_language.py
• Removed unused imports and cleaned up code formatting
• Updated test_check_word_does_not_exist method
• Added a new test for check_word_empty_string method

Fixes #38.

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