Improve label of "nested" relation creation

[alexfournie]

In 2024.11, two options are available to create composition/nested relation between 2 elements:

• Become nested
• Add as nested

When we want to create a relation between 2 elements, we start from one then goes to the second one and so the name of the relation between them should reflect the selection sequence we used : from 1 to 2. And today the relation should be interpreted like that on a creation from Part1 to Part2 :

• Part1 "become nested" in Part2
• "Add" Part2 "as nested" in Part1
  This is not good, so I propose to simplify it with those kinds of labels:
• is nested or is composed
• nests or composes