Allow dot and comma to be overused string literals

[0anton]

I have made things!

Checklist

• I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc)
• I have created at least one test case for the changes I have made
• I have updated the documentation for the changes I have made
• I have added my changes to the CHANGELOG.md

Related issues

Closes #2209

Remarks:

• Added quotes to the reported overused string literal. I had bad time looking for the unescaped dot . in logs. Now the log will write it like '.'
• Replaced wording string constrant overuse with string literal overuse. See for example here for wording usage.
• Fixed wording in the unit test to better describe what it does.

[sobolevn]

Thanks a lot!

[0anton]

Thanks for approving, @sobolevn ! I see that the test is breaking. This is possibly related to the change in the format of the error message, I introduced. Do I have to look at it?

[sobolevn]

Yes, seems related. Can you please fix it?

[0anton]

I fixed failing tests with this 41d090c. Could you @sobolevn please let the pipeline run again?

[0anton]

Ah, my fault that tests fail again: I checked that only test_overused_string.py is successful, not the complete test suit. I'll think of how to improve it and come back.

[sobolevn]

Thank you!

[0anton]

Thank you for fixing tests and bringing this contribution for acceptance!