Bugfix/date relaxed matcher subword month

[wolliq]

Description

Bugfix on date relaxed matcher that catches month subwords, e.g. gauge => aug and parses the wrong month.

Motivation and Context

Issue #6459 .

How Has This Been Tested?

Full regression is green with an added test on the specific use case.

Screenshots (if appropriate):

[info] Tests: succeeded 621, failed 0, canceled 0, ignored 5, pending 0
[info] All tests passed.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Code improvements with no or little impact
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING page.
• I have added tests to cover my changes.
• All new and existing tests passed.