[LANGUAGE] improve error message for unquoted string with comma

[Felienne]

Fixes #3967

How to test

Check the error from #3967 is improved (I have also added tests)

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[jpelay]

Hi Felienne! I like that we are working on our error messages a bit!

I tested the PR, and it does indeed solve the issue, however, maybe we should account for this case too? It's a similar type of error, although, granted, the syntax highlighter already hints that this is not correct code by not coloring the string purple.

[Felienne]

Hi Felienne! I like that we are working on our error messages a bit!

I tested the PR, and it does indeed solve the issue, however, maybe we should account for this case too? It's a similar type of error, although, granted, the syntax highlighter already hints that this is not correct code by not coloring the string purple.

Ah nice idea! Let me see if I can incorporate that into this PR!

[Felienne]

Done!

[jpelay]

Works great!

[mergify]

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[mergify]

Thank you for contributing! Your pull request is now going on the merge train (choo choo! Do not click update from main anymore, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request is now going on the merge train (choo choo! Do not click update from main anymore, and be sure to allow changes to be pushed to your fork).