diff --git a/plugins/importexport/native/locale/en_US/locale.xml b/plugins/importexport/native/locale/en_US/locale.xml
index 7c198e1..5792091 100644
--- a/plugins/importexport/native/locale/en_US/locale.xml
+++ b/plugins/importexport/native/locale/en_US/locale.xml
@@ -84,14 +84,14 @@ The following formats are accepted:
 	<message key="plugins.importexport.native.import.error.trackAbbrevMismatch">The track abbreviation "{$track1Abbrev}" and the track abbreviation "{$track2Abbrev}" matched the different existing conference tracks.</message>
 	<message key="plugins.importexport.native.import.error.trackAbbrevMatch">The track abbreviation "{$trackAbbrev}" matched an existing conference track, but another abbreviation of this track doesn't match with another abbreviation of the existing conference track.</message>
 
-	<message key="plugins.importexport.native.import.error.paperDisciplineLocaleUnsupported">An paper discipline was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperTypeLocaleUnsupported">An paper type was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperSubjectLocaleUnsupported">An paper subject was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperSubjectClassLocaleUnsupported">An paper subject classification was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperCoverageGeoLocaleUnsupported">An paper geographical coverage was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperCoverageChronLocaleUnsupported">An paper geographical coverage was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperCoverageSampleLocaleUnsupported">An paper sample coverage was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
-	<message key="plugins.importexport.native.import.error.paperSponsorLocaleUnsupported">An paper sponsor was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperDisciplineLocaleUnsupported">A paper discipline was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperTypeLocaleUnsupported">A paper type was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperSubjectLocaleUnsupported">A paper subject was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperSubjectClassLocaleUnsupported">A paper subject classification was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperCoverageGeoLocaleUnsupported">A paper geographical coverage was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperCoverageChronLocaleUnsupported">A paper chronological coverage was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperCoverageSampleLocaleUnsupported">A paper sample coverage was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
+	<message key="plugins.importexport.native.import.error.paperSponsorLocaleUnsupported">A paper sponsor was provided for the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
 
 	<message key="plugins.importexport.native.import.error.paperAuthorCompetingInterestsLocaleUnsupported">An author competing interest was provided for the author "{$authorFullName}" of the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>
 	<message key="plugins.importexport.native.import.error.paperAuthorBiographyLocaleUnsupported">An author biography was provided for the author "{$authorFullName}" of the paper "{$paperTitle}" in a locale ("{$locale}") that this conference does not support.</message>