Update components to use sentence case rather than title case
>>> [!note] Migrated issue
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<!-- Migrated from issue #3544778. -->
Reported by: [pameeela](https://www.drupal.org/user/1431110)
Related to !116
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>Mercury uses title case throughout rather than sentence case, which is the Drupal standard for the UI.</p>
<p>I'll do a pass at updating all of these shortly.</p>
issue