ref #6805 Fix DnD positioning when moving and adding new terms
ref #6805 Disallow dropping feature nodes above/below feature trees
Wrap dropping ontology terms into operation
fix #6805 Handle copy/move DND in operations
ref #6805 i18n
ref #6805 Only drop features from term editor to feature tree editor
Rename utility method
ref #6805 Fix term dragging into feature tree editor