Spanish language missing in pgadmin 1.8.3

I upgraded to version 1.8.3, with spanish selected as always, but now,
spanish language have dissappeared completelly, being replaced by
catalonian language.

My system's locale is:
LANG=es_ES
LC_CTYPE="es_ES.utf8"
LC_NUMERIC="es_ES.utf8"
LC_TIME="es_ES.utf8"
LC_COLLATE="es_ES.utf8"
LC_MONETARY="es_ES.utf8"
LC_MESSAGES="es_ES.utf8"
LC_PAPER="es_ES.utf8"
LC_NAME="es_ES.utf8"
LC_ADDRESS="es_ES.utf8"
LC_TELEPHONE="es_ES.utf8"
LC_MEASUREMENT="es_ES.utf8"
LC_IDENTIFICATION="es_ES.utf8"
LC_ALL=es_ES.utf8

(Notice the LANG=es_ES and not ca_ES), so it should display Spanish
language. Furthermore, in options, Spanish is selected as language.