diff --git a/src/loc/lcl/esn/diagnosticMessages/diagnosticMessages.generated.json.lcl b/src/loc/lcl/esn/diagnosticMessages/diagnosticMessages.generated.json.lcl
index 6db71a38ad2..4ac1cfd3caa 100644
--- a/src/loc/lcl/esn/diagnosticMessages/diagnosticMessages.generated.json.lcl
+++ b/src/loc/lcl/esn/diagnosticMessages/diagnosticMessages.generated.json.lcl
@@ -9732,6 +9732,15 @@
         </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[Los identificadores privados solo están permitidos en cuerpos de clase y solo se pueden utilizan como parte de una declaración de un miembro de clase, acceso de propiedad o en la parte izquierda de una expresión "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>
@@ -12687,11 +12696,11 @@
         </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 izquierda de una expresión "in" debe ser de tipo "any", "string", "number" o "symbol".]]></Val>
+            <Val><![CDATA[La parte izquierda de una expresión "in" debe ser un identificador privado o de tipo "any", "string", "number" o "symbol".]]></Val>
           </Tgt>
         </Str>
         <Disp Icon="Str" />
diff --git a/src/loc/lcl/fra/diagnosticMessages/diagnosticMessages.generated.json.lcl b/src/loc/lcl/fra/diagnosticMessages/diagnosticMessages.generated.json.lcl
index c0562829dae..4eda713957b 100644
--- a/src/loc/lcl/fra/diagnosticMessages/diagnosticMessages.generated.json.lcl
+++ b/src/loc/lcl/fra/diagnosticMessages/diagnosticMessages.generated.json.lcl
@@ -9732,6 +9732,15 @@
         </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[Les identificateurs privés ne sont autorisés que dans les corps de classe et ne peuvent être utilisés que dans le cadre d’une déclaration de membre de classe, d’accès à une propriété ou de la partie gauche d’une expression ’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>
@@ -12687,11 +12696,11 @@
         </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 partie gauche d'une expression 'in' doit être de type 'any', 'string', 'number' ou 'symbol'.]]></Val>
+            <Val><![CDATA[La partie gauche d'une expression 'in' doit être un identificateur privé ou de type 'any', 'string', 'number' ou 'symbol'.]]></Val>
           </Tgt>
         </Str>
         <Disp Icon="Str" />
diff --git a/src/loc/lcl/plk/diagnosticMessages/diagnosticMessages.generated.json.lcl b/src/loc/lcl/plk/diagnosticMessages/diagnosticMessages.generated.json.lcl
index 1a8424d50bb..9e6066e18cc 100644
--- a/src/loc/lcl/plk/diagnosticMessages/diagnosticMessages.generated.json.lcl
+++ b/src/loc/lcl/plk/diagnosticMessages/diagnosticMessages.generated.json.lcl
@@ -9707,6 +9707,15 @@
         </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[Identyfikatory prywatne są dozwolone tylko w treściach klasy i mogą być używane tylko jako część deklaracji członka klasy, dostępu do właściwości lub po lewej stronie wyrażenia „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>
@@ -12662,11 +12671,11 @@
         </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[Lewa strona wyrażenia „in” musi być typu „any”, „string”, „number” lub „symbol”.]]></Val>
+            <Val><![CDATA[Lewa strona wyrażenia „in” musi być identyfikatorem prywatnym lub typem „any”, „string”, „number” lub „symbol”.]]></Val>
           </Tgt>
         </Str>
         <Disp Icon="Str" />