fix: Resolve f-string syntax error in language sanitization tests

- Fix backslash in f-string expression on line 588
- Extract string operations outside f-string to avoid syntax error
- Maintain same functionality for error reporting in test suite

Fixes GitHub Actions test failure for Python 3.10+ compatibility

Author: zoharbabin

tests/test_language_sanitization.py

@@ -585,12 +585,14 @@ def main():
     if result.failures:
         print(f"\nFailures:")
         for test, traceback in result.failures:
-            print(f"  - {test}: {traceback.split('AssertionError: ')[-1].split('\\n')[0]}")
+            error_msg = traceback.split('AssertionError: ')[-1].split('\n')[0]
+            print(f"  - {test}: {error_msg}")
 
     if result.errors:
         print(f"\nErrors:")
         for test, traceback in result.errors:
-            print(f"  - {test}: {traceback.split('\\n')[-2]}")
+            error_msg = traceback.split('\n')[-2]
+            print(f"  - {test}: {error_msg}")
 
     return 0 if result.wasSuccessful() else 1