http://archive.xfce.org/src/xfce/thunar/1.5/Thunar-1.5.1.tar.bz2

1) thunar/thunar-standard-view.c: 
-{ "move-to-trash", THUNAR_STOCK_TRASH_FULL, N_ ("Mo_ve to Tash"), NULL, NULL, G_CALLBACK (thunar_standard_view_action_move_to_trash), }
+{ "move-to-trash", THUNAR_STOCK_TRASH_FULL, N_ ("Mo_ve to Trash"), NULL, NULL, G_CALLBACK (thunar_standard_view_action_move_to_trash), }

2) po/ directory does not contain translations for New/Close Tab/Window, Open in [n] New Tabs/Windows, at least in Russian po/ru.po.