OO-4441: wording and use assignment date for oldest opened correction

src/main/java/org/olat/modules/grading/manager/GraderToIdentityDAO.java

@@ -411,7 +411,7 @@ public class GraderToIdentityDAO {
 		  .append(" sum(case when assignment.status ").in(GradingAssignmentStatus.assigned, GradingAssignmentStatus.inProcess)
 		  .append("   and ((assignment.extendedDeadline is null and assignment.deadline < current_date) or assignment.extendedDeadline < current_date )")
 		  .append("   then 1 else 0 end) as overdueAssignments,")
-		  .append(" min(assignment.creationDate)")
+		  .append(" min(assignment.assignmentDate)")
 		  .append(" from gradingassignment as assignment")
 		  .append(" inner join assignment.referenceEntry as refEntry")
 		  .append(" inner join grader2identity rel on (assignment.grader.key=rel.key)")
@@ -445,7 +445,7 @@ public class GraderToIdentityDAO {
 		  .append(" sum(case when assignment.status ").in(GradingAssignmentStatus.assigned, GradingAssignmentStatus.inProcess)
 		  .append("   and ((assignment.extendedDeadline is null and assignment.deadline < current_date) or assignment.extendedDeadline < current_date )")
 		  .append("   then 1 else 0 end) as overdueAssignments,")
-		  .append(" min(assignment.creationDate)")
+		  .append(" min(assignment.assignmentDate)")
 		  .append(" from gradingassignment as assignment")
 		  .append(" inner join grader2identity rel on (assignment.grader.key=rel.key)");
 

src/main/java/org/olat/modules/grading/ui/_i18n/LocalStrings_de.properties

@@ -129,7 +129,7 @@ table.header.absence.leave=Urlaub
 table.header.assessment.date=Pr\u00FCfungsdatum
 table.header.assignment.date=Zuweisungsdatum
 table.header.assignments.done=\# Erledigt
-table.header.assignments.oldest.open=\u00C4lterste
+table.header.assignments.oldest.open=\u00C4lteste
 table.header.assignments.open=\# Offen
 table.header.assignments.overdue=\# \u00DCberf\u00E4llig
 table.header.assignments.total=\# Total