Fix some unit tests

[0xced]

• Fix tests when running them just after midnight
• Fix UTF-8 encoding of the HumanizerHelpersTests.cs file
• Use ConcurrentBag instead of List for collecting concurrent results

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@1b65de9). Click here to learn what that means. The diff coverage is n/a.

:exclamation: Current head 6c1d324 differs from pull request most recent head 8479e0f. Consider uploading reports for the commit 8479e0f to get more accurate results

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  Hits              ?     1191           
  Misses            ?     1359           
  Partials          ?      103           

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[StefH]

@0xced Thank you!