Use language only to identify Spanish translation files

This  allows the  Spanish UI  translation to  work, for  now, for  all
Spanish speaking locales.  If necessary we  can make it es-ES if other
translators feel it is not a good base for their Spanish variant. OTOH
if they just need to l10n a  few strings then, say for Argentina, then
they can do  that in an wsjtx_es_AR.ts and  untranslated strings there
will fall back to the  ones in wsjtx_es.ts automatically. This happens
because of teh way the application loads multiple translation files in
an order suitable for that to happen.

CMakeLists.txt

@@ -1097,8 +1097,8 @@ add_custom_target (etags COMMAND ${ETAGS} -o ${CMAKE_SOURCE_DIR}/TAGS -R ${sourc
 # Qt i18n
 set (LANGUAGES
   en_GB				# English UK
-  pt_PT				# Poutuguese
+  pt				# Poutuguese
-  es_ES				# Spanish
+  es				# Spanish
   ca				# Catalan
   )
 foreach (lang_ ${LANGUAGES})