Add basic tests for program output validation #1
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Added unit tests using Google Test (GTest) to verify translation accuracy.
Implemented tests to check correct output for multiple language translations:
English to Spanish, Russian, Polish, and Chinese.
Source-to-target language translations (e.g., Italian to English, German to English).
Handling of punctuation in translations.
Included stderr capturing to validate error messages for invalid language codes (commented for now due to false capture).