diff --git a/htdocs/admin/translation.php b/htdocs/admin/translation.php
index 2f18bab5896..8b5c05b7bda 100644
--- a/htdocs/admin/translation.php
+++ b/htdocs/admin/translation.php
@@ -101,6 +101,10 @@ if ($action == 'setMAIN_ENABLE_OVERWRITE_TRANSLATION') {
 }
 
 if ($action == 'update') {
+	if ($transkey == '') {
+		setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("Key")), null, 'errors');
+		$error++;
+	}
 	if ($transvalue == '') {
 		setEventMessages($langs->trans("ErrorFieldRequired", $langs->transnoentitiesnoconv("NewTranslationStringToShow")), null, 'errors');
 		$error++;
@@ -108,7 +112,7 @@ if ($action == 'update') {
 	if (!$error) {
 		$db->begin();
 
-		$sql = "UPDATE ".MAIN_DB_PREFIX."overwrite_trans set transvalue = '".$db->escape($transvalue)."' WHERE rowid = ".GETPOST('rowid', 'int');
+		$sql = "UPDATE ".MAIN_DB_PREFIX."overwrite_trans set transkey = '".$db->escape($transkey)."', transvalue = '".$db->escape($transvalue)."' WHERE rowid = ".((int) GETPOST('rowid', 'int'));
 		$result = $db->query($sql);
 		if ($result > 0) {
 			$db->commit();
@@ -324,7 +328,13 @@ if ($mode == 'overwrite') {
 			print '<tr class="oddeven">';
 
 			print '<td>'.$obj->lang.'</td>'."\n";
-			print '<td>'.$obj->transkey.'</td>'."\n";
+			print '<td>';
+			if ($action == 'edit' && $obj->rowid == GETPOST('rowid', 'int')) {
+				print '<input type="text" class="quatrevingtpercent" name="transkey" value="'.dol_escape_htmltag($obj->transkey).'">';
+			} else {
+				print $obj->transkey;
+			}
+			print '</td>'."\n";
 
 			// Value
 			print '<td class="small">';