Resolve "Font color for yellow calendar entries should change"

What does this mr do?

Change the color of the yellow entry into the calendar view

Actions taken to fix bug

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Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• A test was created to test the bug.
• I have updated the documentation accordingly.
• I adhere to the style guide. closes #513 (closed)