Cleaned up unused string resources
diff --git a/plugins/org.eclipse.epf.uma.edit/plugin.properties b/plugins/org.eclipse.epf.uma.edit/plugin.properties
index 652649f..1abd6dc 100755
--- a/plugins/org.eclipse.epf.uma.edit/plugin.properties
+++ b/plugins/org.eclipse.epf.uma.edit/plugin.properties
@@ -412,3 +412,6 @@
_UI_VariabilityType_replaces_literal = replaces
_UI_VariabilityType_localContribution_literal = localContribution
_UI_VariabilityType_localReplacement_literal = localReplacement
+_UI_ArtifactDescriptor_type = Artifact Descriptor
+_UI_DeliverableDescriptor_type = Deliverable Descriptor
+_UI_OutcomeDescriptor_type = Outcome Descriptor
