diff --git a/plugins.xml b/plugins.xml
index 2e67ac7..184ec24 100644
--- a/plugins.xml
+++ b/plugins.xml
@@ -12241,6 +12241,46 @@ the registration of DOIs with mEDRA.</p>]]></description>
 				<version>~3.5.0.0</version>
 			</compatibility>
 			<certification type="official" />
+			<locales>
+				<locale>ar</locale>
+				<locale>az</locale>
+				<locale>bg</locale>
+				<locale>ca</locale>
+				<locale>cs</locale>
+				<locale>da</locale>
+				<locale>de</locale>
+				<locale>en</locale>
+				<locale>es</locale>
+				<locale>fa</locale>
+				<locale>fi</locale>
+				<locale>fr</locale>
+				<locale>fr_CA</locale>
+				<locale>gl</locale>
+				<locale>hu</locale>
+				<locale>hy</locale>
+				<locale>id</locale>
+				<locale>it</locale>
+				<locale>ka</locale>
+				<locale>ku</locale>
+				<locale>mk</locale>
+				<locale>ms</locale>
+				<locale>nb_NO</locale>
+				<locale>nl</locale>
+				<locale>pl</locale>
+				<locale>pt</locale>
+				<locale>pt_BR</locale>
+				<locale>ru</locale>
+				<locale>sk</locale>
+				<locale>sl</locale>
+				<locale>sr_Latn</locale>
+				<locale>sv</locale>
+				<locale>tr</locale>
+				<locale>uk</locale>
+				<locale>uz</locale>
+				<locale>uz_Latn</locale>
+				<locale>vi</locale>
+				<locale>zh_Hans</locale>
+			</locales>
 			<description>Bugfix release for OJS 3.5.0</description>
 		</release>
 	</plugin>
diff --git a/plugins.xsd b/plugins.xsd
index 805803b..2321011 100644
--- a/plugins.xsd
+++ b/plugins.xsd
@@ -50,6 +50,13 @@
 			<element name="package" type="anyURI" minOccurs="1" maxOccurs="1" />
 			<element name="compatibility" type="pkp:compatibilityType" minOccurs="1" maxOccurs="unbounded" />
 			<element name="certification" type="pkp:certificationType" minOccurs="0" maxOccurs="unbounded" />
+			<element name="locales" minOccurs="0" maxOccurs="1">
+				<complexType>
+					<sequence>
+						<element name="locale" type="pkp:locale" minOccurs="1" maxOccurs="unbounded" />
+					</sequence>
+				</complexType>
+			</element>
 			<element name="description" type="pkp:localizedNode" minOccurs="1" maxOccurs="unbounded" />
 		</sequence>
 		<attribute name="date" type="date" use="required" />
@@ -106,7 +113,7 @@
 	<!-- Identifies a particular I18N locale, e.g. en -->
 	<simpleType name="locale">
 		<restriction base="string">
-			<pattern value="[a-z][a-z](_[A-Z][A-Z])?" />
+			<pattern value="([A-Za-z]{2,4})(([_-][A-Za-z]{4,5}|[0-9]{4})?([_-]([A-Za-z]{2}|[0-9]{3}))?)(@[a-z]{2,30})?" />
 		</restriction>
 	</simpleType>