If you are using a server language:
Lowercase using server side language to the text you want to use, and then use the css property for this element to use.
Here's how it worked for me:
Server language: VB.net Inside the repeater - data coming from the database
<span class="capitalize"><%# Eval("RecipientFirstName").ToString.ToLower()%></span>
Converted to lowercase
CSS
.capitalize{ text-transform: capitalize; }
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