DtMail translations and improvements of vcal2xampia.awk

dtmail: messages of the 'Mail Retrieval' menu of dtmail  were left untranslated.
	French, Italian, Spanish translations were added.
vcal2xapia.awk: capacity to handle UTC+n timezones and TODO items added.

cde/programs/localized/fr_FR.ISO8859-1/msg/dtcalc.msg

@@ -1251,7 +1251,7 @@ $
 $ Message 465 - the square root key
 $ 
 
-466 "a"
+466 "w"
 $ 
 $ Message 467 - the Bsp (backspace) key.
 $  \010 is "Control h"