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Resolved by next code:
LWCNormalizedObject obj = new LWCNormalizedObject(persistable, null, locale, null);
obj.load(attributeInnerName);
String displayName = obj.getAttributeDescriptor(attributeInnerName).getLabel();
Resolved by next code:
LWCNormalizedObject obj = new LWCNormalizedObject(persistable, null, locale, null);
obj.load(attributeInnerName);
String displayName = obj.getAttributeDescriptor(attributeInnerName).getLabel();