dtwm: add missing workspace 'Occupy" commands to the C, de, es, fr, and it locales.

The dtwm DefaultWindowMenu did not list any of the workspace enabled
Occupy commands, which makes it a bit difficult to move windows into a
workspace, or to occupy multiple workspaces.

This was rectified by copying the relevant lines from the
SampleWindowMenu sections containing them that already existed in the
localized files.  Tested on C and DE (German).

cde/programs/localized/es_ES.ISO8859-1/config/sys.dtwmrc.tmsg

@@ -142,6 +142,10 @@ $ *--------------------------------------------------------------------------*
     \"Minimizar\"\t_n\tAlt<Key>F9\tf.minimize\n\
     \"Maximizar\"\t_x\tAlt<Key>F10\tf.maximize\n\
     \"Bajar\"\t_P\tAlt<Key>F3\tf.lower\n\
+     no-label\t\t\t\t\t\tf.separator\n\
+    \"Ocupar Espacio de trabajo...\"\t_O\t\t\tf.workspace_presence\n\
+    \"Ocupar todos los Espacios de Trabajo\"\t_T\t\t\tf.occupy_all\n\
+    \"Desocupar Espacio de trabajo\"\t_u\t\t\tf.remove\n\
     no-label\t\t\t\tf.separator\n\
     \"Cerrar\"\t_C\tAlt<Key>F4\tf.kill"
 $ *