feat(style): add text-transform variable

[silvester-pari]

Implemented changes

This PR introduces a new CSS variable called text-transform. With this, the default text-transform of filter property titles, filter properties and results can be overridden (default is capitalize).

Screenshots/Videos

Default (capitalize)

--text-transform: none

--text-transform: uppercase

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[lubojr]

Very convenient solution without introducing a new property. Thank you!