Fixes a typo in upgrade functions, a=chris

diff --git a/lib/upgrade_functions.php b/lib/upgrade_functions.php
index b764cf3..9d77a23 100644
--- a/lib/upgrade_functions.php
+++ b/lib/upgrade_functions.php
@@ -311,7 +311,7 @@ function upgradeDatabaseVersion9(&$db)

     $db->execute("DELETE FROM ACTIVITY WHERE TRANSLATION_ID >= 8");
     $db->execute("DELETE FROM TRANSLATION WHERE TRANSLATION_ID >= 8");
-    $db->execute("DELETE FROM TRANSLATION_LOCALE WHERE TRANSLATION_ID >+ 8");
+    $db->execute("DELETE FROM TRANSLATION_LOCALE WHERE TRANSLATION_ID >= 8");
     $db->execute("INSERT INTO ACTIVITY VALUES (8, 8, 'searchSources')");
     $db->execute("INSERT INTO ACTIVITY VALUES (9, 9, 'manageMachines')");
     $db->execute("INSERT INTO ACTIVITY VALUES (10, 10, 'manageLocales')");