Creates better title case representation so that articles and prepositions shorter than 4 characters remain lowercase

[jcasteele]

Creates better title case representation so that articles and prepositions shorter than 4 characters remain lowercase. Fixes #935

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• [x] Implementation is clean
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• [x] Link to the issue(s) you're fixing from your PR description. Use fixes #<the issue number>
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[dnfadmin]

All CLA requirements met.

[SimonCropp]

@jcasteele can you add some tests for these changes