diff --git a/src/loc/lcl/ita/diagnosticMessages/diagnosticMessages.generated.json.lcl b/src/loc/lcl/ita/diagnosticMessages/diagnosticMessages.generated.json.lcl
index b6bfdc2fc11..f511547afde 100644
--- a/src/loc/lcl/ita/diagnosticMessages/diagnosticMessages.generated.json.lcl
+++ b/src/loc/lcl/ita/diagnosticMessages/diagnosticMessages.generated.json.lcl
@@ -9720,6 +9720,15 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Private_identifiers_are_only_allowed_in_class_bodies_and_may_only_be_used_as_part_of_a_class_member__1451" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Private identifiers are only allowed in class bodies and may only be used as part of a class member declaration, property access, or on the left-hand-side of an 'in' expression]]></Val>
+          <Tgt Cat="Text" Stat="Loc" Orig="New">
+            <Val><![CDATA[Gli identificatori privati sono consentiti solo nei corpi di classe e possono essere usati solo come parte di una dichiarazione di un membro della classe, dell'accesso alle proprietà o sulla parte sinistra di un'espressione 'in'.]]></Val>
+          </Tgt>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Private_identifiers_are_only_available_when_targeting_ECMAScript_2015_and_higher_18028" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Private identifiers are only available when targeting ECMAScript 2015 and higher.]]></Val>
@@ -12675,11 +12684,11 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
-      <Item ItemId=";The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol_2360" ItemType="0" PsrId="306" Leaf="true">
+      <Item ItemId=";The_left_hand_side_of_an_in_expression_must_be_a_private_identifier_or_of_type_any_string_number_or__2360" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
-          <Val><![CDATA[The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.]]></Val>
+          <Val><![CDATA[The left-hand side of an 'in' expression must be a private identifier or of type 'any', 'string', 'number', or 'symbol'.]]></Val>
           <Tgt Cat="Text" Stat="Loc" Orig="New">
-            <Val><![CDATA[La parte sinistra di un'espressione 'in' deve essere di tipo 'any', 'string', 'number' o 'symbol'.]]></Val>
+            <Val><![CDATA[La parte sinistra di un'espressione 'in' deve essere un identificatore privato o di tipo 'any', 'string', 'number' o 'symbol'.]]></Val>
           </Tgt>
         </Str>
         <Disp Icon="Str" />
diff --git a/src/loc/lcl/kor/diagnosticMessages/diagnosticMessages.generated.json.lcl b/src/loc/lcl/kor/diagnosticMessages/diagnosticMessages.generated.json.lcl
index 24de1858359..c61d738da71 100644
--- a/src/loc/lcl/kor/diagnosticMessages/diagnosticMessages.generated.json.lcl
+++ b/src/loc/lcl/kor/diagnosticMessages/diagnosticMessages.generated.json.lcl
@@ -9720,6 +9720,15 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
+      <Item ItemId=";Private_identifiers_are_only_allowed_in_class_bodies_and_may_only_be_used_as_part_of_a_class_member__1451" ItemType="0" PsrId="306" Leaf="true">
+        <Str Cat="Text">
+          <Val><![CDATA[Private identifiers are only allowed in class bodies and may only be used as part of a class member declaration, property access, or on the left-hand-side of an 'in' expression]]></Val>
+          <Tgt Cat="Text" Stat="Loc" Orig="New">
+            <Val><![CDATA[비공개 식별자는 클래스 본문에서만 허용되며 클래스 멤버 선언의 일부, 속성 액세스 또는 'in' 식의 왼쪽에서만 사용할 수 있습니다.]]></Val>
+          </Tgt>
+        </Str>
+        <Disp Icon="Str" />
+      </Item>
       <Item ItemId=";Private_identifiers_are_only_available_when_targeting_ECMAScript_2015_and_higher_18028" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
           <Val><![CDATA[Private identifiers are only available when targeting ECMAScript 2015 and higher.]]></Val>
@@ -12675,11 +12684,11 @@
         </Str>
         <Disp Icon="Str" />
       </Item>
-      <Item ItemId=";The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol_2360" ItemType="0" PsrId="306" Leaf="true">
+      <Item ItemId=";The_left_hand_side_of_an_in_expression_must_be_a_private_identifier_or_of_type_any_string_number_or__2360" ItemType="0" PsrId="306" Leaf="true">
         <Str Cat="Text">
-          <Val><![CDATA[The left-hand side of an 'in' expression must be of type 'any', 'string', 'number', or 'symbol'.]]></Val>
+          <Val><![CDATA[The left-hand side of an 'in' expression must be a private identifier or of type 'any', 'string', 'number', or 'symbol'.]]></Val>
           <Tgt Cat="Text" Stat="Loc" Orig="New">
-            <Val><![CDATA['in' 식의 왼쪽은 'any', 'string', 'number' 또는 'symbol' 유형이어야 합니다.]]></Val>
+            <Val><![CDATA['in' 식의 왼쪽은 비공개 식별자이거나 'any', 'string', 'number' 또는 'symbol' 유형이어야 합니다.]]></Val>
           </Tgt>
         </Str>
         <Disp Icon="Str" />