fix: wrong text-color class and text contrast on dates page

[ihor-romaniuk]

Description:

This pull request contains minor fixes with text colors.

• Fixed wrong text-color class on dates page
• Increase text color contrast on dates page

Before	After

Related Pull Requests

PR to the master branch: #1223
PR to the open-release/quince.master branch: #1229

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (open-release/palm.master@73610bf). Click here to learn what that means.

Additional details and impacted files

@@                     Coverage Diff                     @@
##             open-release/palm.master    #1222   +/-   ##
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  Coverage                            ?   86.95%           
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  Files                               ?      253           
  Lines                               ?     4371           
  Branches                            ?     1108           
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  Hits                                ?     3801           
  Misses                              ?      551           
  Partials                            ?       19           

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[itsjeyd]

Hi @ihor-romaniuk, thank you for this contribution!

I'm assuming that the changes are ready for review, but let me know if you were planning on working on them some more.

[ihor-romaniuk]

Hi @itsjeyd, this PR is ready for review, thanks.

[openedx-webhooks]

@ihor-romaniuk 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.