[BUGFIX] Wrong where condition in plugin flexform

Configuration/FlexForms/ListByCategory.xml

@@ -31,7 +31,7 @@
 								<size>5</size>
 								<maxitems>99</maxitems>
 								<foreign_table>pages</foreign_table>
-								<foreign_table_where>AND sys_language_uid = 0 AND doktype = 117 ORDER BY title</foreign_table_where>
+								<foreign_table_where>AND sys_language_uid IN (-1, 0) AND doktype = 117 ORDER BY title</foreign_table_where>
 							</config>
 						</TCEforms>
 					</settings.categories>