diff --git a/classes/publication/Publication.inc.php b/classes/publication/Publication.inc.php
index da83ab583f5..2b30f7a4bf7 100644
--- a/classes/publication/Publication.inc.php
+++ b/classes/publication/Publication.inc.php
@@ -36,6 +36,30 @@ public function getEditorString() {
 		return join(__('common.commaListSeparator') . ' ', $editorNames);
 	}
 
+	/**
+	 * Get the URL to a cover image
+	 *
+	 * @param int $contextId
+	 * @param string $preferredLocale Return the cover image in a specified locale.
+	 * @return string
+	 */
+	public function getCoverImageUrl($contextId, $preferredLocale = null) {
+		$coverImage = $this->getData('coverImage', $preferredLocale);
+
+		if (!$coverImage) {
+			return Application::get()->getRequest()->getBaseUrl() . '/templates/images/book-default.png';
+		}
+
+		import('classes.file.PublicFileManager');
+		$publicFileManager = new PublicFileManager();
+
+		return join('/', [
+			Application::get()->getRequest()->getBaseUrl(),
+			$publicFileManager->getContextFilesPath($contextId),
+			$coverImage['uploadName'],
+		]);
+	}
+
 	/**
 	 * Get the URL to a localized cover image
 	 *
diff --git a/lib/pkp b/lib/pkp
index bf243e1e25e..058e5f4c4de 160000
--- a/lib/pkp
+++ b/lib/pkp
@@ -1 +1 @@
-Subproject commit bf243e1e25e25523434916e1c54c172f6169c702
+Subproject commit 058e5f4c4de7cdc2ebbb8889c032f309f6d6da3b
diff --git a/plugins/importexport/onix30/filter/MonographONIX30XmlFilter.inc.php b/plugins/importexport/onix30/filter/MonographONIX30XmlFilter.inc.php
index fd9eb2310df..7f67fa29406 100644
--- a/plugins/importexport/onix30/filter/MonographONIX30XmlFilter.inc.php
+++ b/plugins/importexport/onix30/filter/MonographONIX30XmlFilter.inc.php
@@ -3,8 +3,8 @@
 /**
  * @file plugins/importexport/onix30/filter/MonographONIX30XmlFilter.inc.php
  *
- * Copyright (c) 2014-2021 Simon Fraser University
- * Copyright (c) 2000-2021 John Willinsky
+ * Copyright (c) 2014-2024 Simon Fraser University
+ * Copyright (c) 2000-2024 John Willinsky
  * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
  *
  * @class MonographONIX30XmlFilter
@@ -29,7 +29,6 @@ function __construct($filterGroup) {
 		parent::__construct($filterGroup);
 	}
 
-
 	//
 	// Implement template methods from PersistableFilter
 	//
@@ -121,7 +120,7 @@ function createHeaderNode($doc) {
 		$senderNode->appendChild($senderIdentifierNode);
 
 		// Assemble SenderName element.
-		$senderNode->appendChild($this->_buildTextNode($doc, 'SenderName', $context->getLocalizedName()));
+		$senderNode->appendChild($this->_buildTextNode($doc, 'SenderName', $context->getName($context->getPrimaryLocale())));
 		$senderNode->appendChild($this->_buildTextNode($doc, 'ContactName', $context->getContactName()));
 		$senderNode->appendChild($this->_buildTextNode($doc, 'EmailAddress', $context->getContactEmail()));
 
@@ -248,13 +247,14 @@ function createProductNode($doc, $submission, $publicationFormat) {
 		/* --- License information --- */
 
 		$publication = $submission->getCurrentPublication();
+		$pubLocale = $publication->getData('locale');
 
 		if ($publication->isCCLicense()) {
-			AppLocale::requireComponents(LOCALE_COMPONENT_PKP_SUBMISSION); // For CC License Names
+			AppLocale::requireComponents(LOCALE_COMPONENT_PKP_SUBMISSION, $pubLocale); // For CC License Names
 			$licenseOpts = Application::getCCLicenseOptions();
 			$licenseUrl = $publication->getData('licenseUrl');
 			if (array_key_exists($licenseUrl, $licenseOpts)) {
-				$licenseName = (__($licenseOpts[$licenseUrl], [], $publication->getData('locale')));
+				$licenseName = (__($licenseOpts[$licenseUrl], [], $pubLocale));
 
 				$epubLicenseNode = $doc->createElementNS($deployment->getNamespace(), 'EpubLicense');
 				$descDetailNode->appendChild($epubLicenseNode);
@@ -291,19 +291,25 @@ function createProductNode($doc, $submission, $publicationFormat) {
 				$titleElementNode->appendChild($this->_buildTextNode($doc, 'PartNumber', $submission->getCurrentPublication()->getData('seriesPosition')));
 			}
 
-			if ($series->getLocalizedPrefix() == '' || $series->getLocalizedTitle(false) == '') {
-				$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleText', trim(join(' ', array($series->getLocalizedPrefix(), $series->getLocalizedTitle(false))))));
+			$seriesLocale = $pubLocale;
+			// If the series title doesn't exist in the submission locale, use the press locale
+			if ($series->getTitle($seriesLocale, false) == '') {
+				$seriesLocale = $context->getPrimaryLocale();
+			}
+
+			if ($series->getPrefix($seriesLocale) == '' || $series->getTitle($seriesLocale, false) == '') {
+				$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleText', trim(join(' ', array($series->getPrefix($seriesLocale), $series->getTitle($seriesLocale, false))))));
 			} else {
-				if ($series->getLocalizedPrefix() != '') {
-					$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitlePrefix', $series->getLocalizedPrefix()));
+				if ($series->getPrefix($seriesLocale) != '') {
+					$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitlePrefix', $series->getPrefix($seriesLocale)));
 				} else {
 					$titleElementNode->appendChild($doc->createElementNS($deployment->getNamespace(), 'NoPrefix'));
 				}
-				$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleWithoutPrefix', $series->getLocalizedTitle(false)));
+				$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleWithoutPrefix', $series->getTitle($seriesLocale, false)));
 			}
 
-			if ($series->getLocalizedSubtitle() != '') {
-				$titleElementNode->appendChild($this->_buildTextNode($doc, 'Subtitle', $series->getLocalizedSubtitle()));
+			if ($series->getSubtitle($seriesLocale) != '') {
+				$titleElementNode->appendChild($this->_buildTextNode($doc, 'Subtitle', $series->getSubtitle($seriesLocale)));
 			}
 		} else {
 			$seriesCollectionNode = $doc->createElementNS($deployment->getNamespace(), 'NoCollection');
@@ -322,20 +328,20 @@ function createProductNode($doc, $submission, $publicationFormat) {
 
 		$productTitleDetailNode->appendChild($titleElementNode);
 
-		if (!$publication->getLocalizedData('prefix') || !$publication->getLocalizedData('title')) {
-			$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleText', trim($publication->getLocalizedData('prefix') ?? $publication->getLocalizedTitle())));
+		if (!$publication->getData('prefix', $pubLocale) || !$publication->getData('title', $pubLocale)) {
+			$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleText', trim($publication->getData('prefix', $pubLocale) ?? $publication->getData('title', $pubLocale))));
 		} else {
-			if ($publication->getLocalizedData('prefix')) {
-				$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitlePrefix', $publication->getLocalizedData('prefix')));
+			if ($publication->getData('prefix', $pubLocale)) {
+				$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitlePrefix', $publication->getData('prefix', $pubLocale)));
 			} else {
 				$titleElementNode->appendChild($doc->createElementNS($deployment->getNamespace(), 'NoPrefix'));
 			}
 
-			$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleWithoutPrefix', $publication->getLocalizedTitle()));
+			$titleElementNode->appendChild($this->_buildTextNode($doc, 'TitleWithoutPrefix', $publication->getData('title', $pubLocale)));
 		}
 
-		if ($publication->getData('subtitle', $publication->getData('locale'))) {
-			$titleElementNode->appendChild($this->_buildTextNode($doc, 'Subtitle', $publication->getData('subtitle', $publication->getData('locale'))));
+		if ($publication->getData('subtitle', $pubLocale)) {
+			$titleElementNode->appendChild($this->_buildTextNode($doc, 'Subtitle', $publication->getData('subtitle', $pubLocale)));
 		}
 
 		/* --- Contributor information --- */
@@ -355,17 +361,17 @@ function createProductNode($doc, $submission, $publicationFormat) {
 			$role = array_key_exists($nameKey, $userGroupOnixMap) ? $userGroupOnixMap[$nameKey] : 'Z99'; // Z99 - unknown contributor type.
 
 			$contributorNode->appendChild($this->_buildTextNode($doc, 'ContributorRole', $role));
-			$contributorNode->appendChild($this->_buildTextNode($doc, 'PersonName', $author->getFullName(false)));
-			$contributorNode->appendChild($this->_buildTextNode($doc, 'PersonNameInverted', $author->getFullName(false, true)));
-			$contributorNode->appendChild($this->_buildTextNode($doc, 'NamesBeforeKey', $author->getLocalizedGivenName()));
-			if ($author->getLocalizedFamilyName() != '') {
-				$contributorNode->appendChild($this->_buildTextNode($doc, 'KeyNames', $author->getLocalizedFamilyName()));
+			$contributorNode->appendChild($this->_buildTextNode($doc, 'PersonName', $author->getFullName(false, false, null, $pubLocale)));
+			$contributorNode->appendChild($this->_buildTextNode($doc, 'PersonNameInverted', $author->getFullName(false, true, null, $pubLocale)));
+			$contributorNode->appendChild($this->_buildTextNode($doc, 'NamesBeforeKey', $author->getGivenName($pubLocale)));
+			if ($author->getFamilyName($pubLocale) != '') {
+				$contributorNode->appendChild($this->_buildTextNode($doc, 'KeyNames', $author->getFamilyName($pubLocale)));
 			} else {
-				$contributorNode->appendChild($this->_buildTextNode($doc, 'KeyNames', $author->getFullName(false)));
+				$contributorNode->appendChild($this->_buildTextNode($doc, 'KeyNames', $author->getFullName(false, false, null, $pubLocale)));
 			}
 
-			if ($author->getLocalizedBiography() != '') {
-				$contributorNode->appendChild($this->_buildTextNode($doc, 'BiographicalNote', $author->getLocalizedBiography()));
+			if ($author->getBiography($pubLocale) != '') {
+				$contributorNode->appendChild($this->_buildTextNode($doc, 'BiographicalNote', $author->getBiography($pubLocale)));
 			}
 
 			if ($author->getCountry() != '') {
@@ -442,13 +448,13 @@ function createProductNode($doc, $submission, $publicationFormat) {
 			$subjectNode->appendChild($this->_buildTextNode($doc, 'SubjectSchemeIdentifier', '12')); // 12 is BIC subject category code list.
 			$subjectNode->appendChild($this->_buildTextNode($doc, 'SubjectSchemeVersion', '2')); // Version 2 of ^^
 
-			$allSubjects = ($publication->getData('subjects')[$publication->getData('locale')]);
+			$allSubjects = ($publication->getData('subjects')[$pubLocale]);
 			$subjectNode->appendChild($this->_buildTextNode($doc, 'SubjectCode', trim(join(', ', $allSubjects))));
 			$descDetailNode->appendChild($subjectNode);
 		}
 
 		if ($publication->getData('keywords')) {
-			$allKeywords = ($publication->getData('keywords')[$publication->getData('locale')]);
+			$allKeywords = ($publication->getData('keywords')[$pubLocale]);
 			$keywordNode = $doc->createElementNS($deployment->getNamespace(), 'Subject');
 			$keywordNode->appendChild($this->_buildTextNode($doc, 'SubjectSchemeIdentifier', '20')); // Keywords
 			$keywordNode->appendChild($this->_buildTextNode($doc, 'SubjectHeadingText', trim(join(', ', $allKeywords))));
@@ -493,7 +499,7 @@ function createProductNode($doc, $submission, $publicationFormat) {
 		$collateralDetailNode = $doc->createElementNS($deployment->getNamespace(), 'CollateralDetail');
 		$productNode->appendChild($collateralDetailNode);
 
-		$abstract = strip_tags($publication->getLocalizedData('abstract'));
+		$abstract = strip_tags($publication->getData('abstract', $pubLocale));
 
 		$textContentNode = $doc->createElementNS($deployment->getNamespace(), 'TextContent');
 		$collateralDetailNode->appendChild($textContentNode);
@@ -517,7 +523,7 @@ function createProductNode($doc, $submission, $publicationFormat) {
 		$resourceVersionNode = $doc->createElementNS($deployment->getNamespace(), 'ResourceVersion');
 		$supportingResourceNode->appendChild($resourceVersionNode);
 		$resourceVersionNode->appendChild($this->_buildTextNode($doc, 'ResourceForm', '01')); // Linkable resource
-		$resourceVersionNode->appendChild($this->_buildTextNode($doc, 'ResourceLink', $publication->getLocalizedCoverImageUrl($context->getId(), $publication->getData('locale'))));
+		$resourceVersionNode->appendChild($this->_buildTextNode($doc, 'ResourceLink', $publication->getCoverImageUrl($context->getId(), $pubLocale)));
 
 		/* --- Publishing Detail --- */
 
@@ -707,15 +713,16 @@ function createProductNode($doc, $submission, $publicationFormat) {
 			$supplyDetailNode = $doc->createElementNS($deployment->getNamespace(), 'SupplyDetail');
 			$productSupplyNode->appendChild($supplyDetailNode);
 
+			$supplierNode = $doc->createElementNS($deployment->getNamespace(), 'Supplier');
+			$supplyDetailNode->appendChild($supplierNode);
 			if (isset($supplier)) {
-				$supplierNode = $doc->createElementNS($deployment->getNamespace(), 'Supplier');
-				$supplyDetailNode->appendChild($supplierNode);
 
 				$supplierNode->appendChild($this->_buildTextNode($doc, 'SupplierRole', $supplier->getRole()));
 				$supplierNode->appendChild($this->_buildTextNode($doc, 'SupplierName', $supplier->getName()));
 				if ($supplier->getPhone()) {
 					$supplierNode->appendChild($this->_buildTextNode($doc, 'TelephoneNumber', $supplier->getPhone()));
 				}
+
 				if ($supplier->getEmail()) {
 					$supplierNode->appendChild($this->_buildTextNode($doc, 'EmailAddress', $supplier->getEmail()));
 				}
@@ -735,12 +742,8 @@ function createProductNode($doc, $submission, $publicationFormat) {
 
 				$supplierWebsiteNode->appendChild($this->_buildTextNode($doc, 'WebsiteRole', '29')); // 29 -> Web page for full content
 				$supplierWebsiteNode->appendChild($this->_buildTextNode($doc, 'WebsiteLink', $request->url($context->getPath(), 'catalog', 'book', $submissionBestId)));
-				unset($supplierNode);
-				unset($supplierWebsiteNode);
 
 			} else { // No suppliers specified, use the Press settings instead.
-				$supplierNode = $doc->createElementNS($deployment->getNamespace(), 'Supplier');
-				$supplyDetailNode->appendChild($supplierNode);
 
 				$supplierNode->appendChild($this->_buildTextNode($doc, 'SupplierRole', '09')); // Publisher supplying to end customers
 				$supplierNode->appendChild($this->_buildTextNode($doc, 'SupplierName', $context->getData('publisher')));
@@ -755,9 +758,9 @@ function createProductNode($doc, $submission, $publicationFormat) {
 				$supplierWebsiteNode->appendChild($this->_buildTextNode($doc, 'WebsiteRole', '18')); // 18 -> Public website
 				$supplierWebsiteNode->appendChild($this->_buildTextNode($doc, 'WebsiteLink', $request->url($context->getPath())));
 
-				unset($supplierNode);
-				unset($supplierWebsiteNode);
 			}
+			unset($supplierNode);
+			unset($supplierWebsiteNode);
 
 			if ($publicationFormat->getReturnableIndicatorCode() != '') {
 				$returnsNode = $doc->createElementNS($deployment->getNamespace(), 'ReturnsConditions');
@@ -892,5 +895,3 @@ function _buildTextNode($doc, $nodeName, $textContent) {
 		return $node;
 	}
 }
-
-