Switch to a single common Catalan language translation file

Xavi,  EA3W, assures  me that  all Catalan  dialects and  variants are
essentially  the same,  so there's  no  need to  have country  variant
specific Catalan translation files.

CMakeLists.txt

@@ -1094,8 +1094,10 @@ add_custom_target (etags COMMAND ${ETAGS} -o ${CMAKE_SOURCE_DIR}/TAGS -R ${sourc
 
 # Qt i18n
 set (LANGUAGES
-  en_GB
-  pt_PT
+  en_GB				# English UK
+  pt_PT				# Poutuguese
+  es_ES				# Spanish
+  ca				# Catalan
   )
 foreach (lang_ ${LANGUAGES})
   file (TO_NATIVE_PATH translations/wsjtx_${lang_}.ts ts_)