Use the CSS property text-transform for capitalizing words. Add the property to the classes qa-q-item-title and qa-main-heading to capitalize question titles in both question list and question view.
.qa-q-item-title, .qa-main-heading { text-transform: capitalize; }
Note that this will capitalize all words rather than doing correct capitalization (example: "foo the bar" would be rendered as "Foo The Bar" instead of "Foo the Bar" with a lowercase "the").
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