mo2json ???

#!/usr/bin/python
# from http://archive.plugins.jquery.com/project/gettext
# to extract strings to a .po file, you can use standard gettext utilities like xgettext and msgfmt; to generate the JSON, one could use the following Python snippet, assuming a domain.mo file exists under path/lang/LC_MESSAGES:
import simplejson as enc
import gettext
def gettext_json(domain, path, lang = [], indent = False):
    try:
        tr = gettext.translation(domain, path, lang)
        # for unknown reasons, instead of having plural entries like
        # key: [sg, pl1...]
        # tr._catalog has (key, n): pln,
        keys = tr._catalog.keys()
        keys.sort()
        ret = {}
        for k in keys:
            v = tr._catalog[k]
            if type(k) is tuple:
                if k[0] not in ret:
                    ret[k[0]] = []
                ret[k[0]].append(v)
            else:
                ret[k] = v
        return enc.dumps(ret, ensure_ascii = False, indent = indent)
    except IOError:
        return None

# call our convert function
print gettext_json('default', '/path/to/opac/locale/', 'en_US.UTF8')