* Remove null check from MapperContext.SetCulture and .SetSegment
We need to be able to set these to null, since null = invariant / default segment
* show segment label on property
* Add ContentVariation to ContentPropertyDisplay
* Add ContentVariation to DocumentTypeDisplay
* Change variations to be on ContentTypeBasic.cs
* don't cache value
* show correct label and unlock text for culture and segment variations
* make lock overlay take up less space
Co-authored-by: nikolajlauridsen <nikolajlauridsen@protonmail.ch>
Co-authored-by: Zeegaan <nge@umbraco.dk>
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