In many2many lists, the remove record from the widget is a trash bin.
It is confusing, as people feel they are deleting it when they are
only unlinking it.
So in many2many, we propose to change the trash icon by a 'X'.
This icon appears in many2many relations and in many2many widgets:
even though hr.expense.sheet defines the expense lines as a one2many,
it uses a many2many widget, so we use a 'X' instead of the trash bin.
To avoid ambiguity, we decided to rename 'delete' to 'remove'.
Alexandre Kühn
8bc7cebd9c