Modify values in legend bar: for slope and elevation

My name is Piero from Milan, Italy. Is it possible to change or modify in legend the values of the slope from degrees to percentage?
Is it possible modify in legende the elevations values in a new scale, for ex.: 0-5 meter, 5-10, 10-20, etc. to the higher limit?
I work on vs. 14 in italian.
Thanks and regards 
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