[Rajpal14]

What GitHub issue does this PR apply to?

Resolves #826

What changed and why?

The check_concepts method in validatelanginfofiles.py previously assumed that the concepts field in a language JSON file is always a dictionary (concepts.items()). When a malformed file contained a non-dictionary data type (such as a list, string, or null), the command crashed with an unhandled AttributeError instead of reporting a validation error and continuing.

This PR:

1. Adds a type check isinstance(concepts, dict) to check_concepts. If concepts is not an object/mapping, it logs an error in the project's standard format ([Error] \` has a `concepts` section that is not an object`) and safely returns.
2. Adds a dedicated regression test suite in web/tests/test_validatelanginfofiles_regression.py testing non-dict inputs (list, str, None) to verify error reporting and crash prevention.

AI bots used in the process of making this PR

Google Antigravity & OpenAI ChatGPT were used for codebase exploration, reproducing the issue, and structuring the regression test suite. All code, tests, and diffs were reviewed and verified locally.

Checklist

• I claimed any associated issue(s) and they are not someone else's
• I have looked at documentation to ensure I made any revisions correctly
• I tested my changes locally to ensure they work
• For language files, I have validated the edited files are valid JSON and data shows up correctly
• For website code edits, I have added or edited any appropriate unit tests for my changes
• If I used artificial intelligence (AI), I have reviewed the suggested changes and ensured they work correctly

Any additional comments or things to be aware of while reviewing?

All 130 tests pass locally (python manage.py test web).