diff --git a/backend/src/main/resources/i18n/messages.properties b/backend/src/main/resources/i18n/messages.properties
index e2581fdd2..ff66ef05a 100644
--- a/backend/src/main/resources/i18n/messages.properties
+++ b/backend/src/main/resources/i18n/messages.properties
@@ -59,6 +59,10 @@ action.restore=Restore
 action.view-only-changes=View Only Changes
 action.user-role=User Role
 action.toggle-view=Toggle view
+action.advanced=Advanced
+action.add-new-attribute=Add new attribute
+action.add-attribute=Add Attribute
+action.custom-entity-attributes=Custom Entity Attributes
 
 value.enabled=Enabled
 value.disabled=Disabled
@@ -97,6 +101,12 @@ value.local-dynamic-metadata-provider=LocalDynamicMetadataProvider
 
 value.md-query-protocol=MetadataQueryProtocol
 value.template=Template
+value.string=String
+value.boolean=Boolean
+value.list=List
+value.BOOLEAN=Boolean
+value.SELECTION_LIST=List
+value.STRING=String
 
 brand.header.title=Source Management
 brand.logo-link-label=Shibboleth
@@ -120,6 +130,21 @@ heading.shibboleth=Shibboleth
 
 label.source-configuration=Metadata Source Configuration
 label.provider-configuration=Metadata Provider Configuration
+label.entity-attribute-name=Custom Entity Attribute Name
+tooltip.entity-attribute-name=Custom Entity Attribute Name
+label.entity-attribute-type=Attribute Type
+tooltip.entity-attribute-type=Attribute Type
+label.entity-attribute-help=Help Text
+tooltip.entity-attribute-help=Help Text
+label.entity-attribute-default=Default Value
+tooltip.entity-attribute-default=Default Value
+label.entity-attribute-list-options=List options
+tooltip.entity-attribute-list-options=List options
+
+label.entity-attributes=Entity Attributes
+label.custom-entity-attributes=Custom Entity Attributes
+label.help-text=Help text
+label.default-value=Default Value
 
 label.metadata-source=Metadata Source
 label.metadata-sources=Metadata Sources
@@ -436,6 +461,9 @@ label.provider=Metadata Provider
 message.delete-user-title=Delete User?
 message.delete-user-body=You are requesting to delete a user. If you complete this process the user will be removed. This cannot be undone. Do you wish to continue?
 
+message.delete-attribute-title=Delete Attribute?
+message.delete-attribute-body=You are requesting to delete a custom attribute. If you complete this process the attribute will be removed. This cannot be undone. Do you wish to continue?
+
 message.must-be-unique=Must be unique.
 message.name-must-be-unique=Name must be unique.
 message.uri-valid-format=URI must be valid format.