How to use the xdg.Locale function in xdg

def __addLocale(self, key, group=None):
        "add locale to key according the current lc_messages"
        # set default group
        if not group:
            group = self.defaultGroup

        for lang in xdg.Locale.langs:
            if self.content[group].has_key(key+'['+lang+']'):
                return key+'['+lang+']'

        return key

def set(self, key, value, group=None, locale=False):
        # set default group
        if not group:
            group = self.defaultGroup

        if locale == True and len(xdg.Locale.langs) > 0:
            key = key + "[" + xdg.Locale.langs[0] + "]"

        try:
            self.content[group][key] = value
        except KeyError:
            raise NoGroupError(group, self.filename)
            
        self.tainted = (value == self.get(key, group))

def checkKey(self, key, value, group):
        # standard keys     
        if group == self.defaultGroup:
            if re.match("^Name"+xdg.Locale.regex+"$", key):
                pass
            elif re.match("^Comment"+xdg.Locale.regex+"$", key):
                pass
            elif key == "Inherits":
                self.checkValue(key, value, list=True)
            elif key == "Directories":
                self.checkValue(key, value, list=True)
            elif key == "Hidden":
                self.checkValue(key, value, type="boolean")
            elif key == "Example":
                self.checkValue(key, value)
            elif re.match("^X-[a-zA-Z0-9-]+", key):
                pass
            else:
                self.errors.append("Invalid key: %s" % key)
        elif group in self.getDirectories():

def __addLocale(self, key, group=None):
        "add locale to key according the current lc_messages"
        # set default group
        if not group:
            group = self.defaultGroup

        for lang in xdg.Locale.langs:
            langkey = "%s[%s]" % (key, lang)
            if langkey in self.content[group]:
                return langkey

        return key

def _load(self):
        "Loads comment for current language. Use get_comment() instead."
        resource = os.path.join('mime', self.media, self.subtype + '.xml')
        for path in BaseDirectory.load_data_paths(resource):
            doc = minidom.parse(path)
            if doc is None:
                continue
            for comment in doc.documentElement.getElementsByTagNameNS(FREE_NS, 'comment'):
                lang = comment.getAttributeNS(XML_NAMESPACE, 'lang') or 'en'
                goodness = 1 + (lang in xdg.Locale.langs)
                if goodness > self._comment[0]:
                    self._comment = (goodness, _get_node_data(comment))
                if goodness == 2: return

def checkKey(self, key, value, group):
        # standard keys     
        if re.match("^DisplayName"+xdg.Locale.regex+"$", key):
            pass
        elif key == "EmbeddedTextRectangle":
            self.checkValue(key, value, type="integer", list=True)
        elif key == "AttachPoints":
            self.checkValue(key, value, type="point", list=True)
        elif re.match("^X-[a-zA-Z0-9-]+", key):
            pass
        else:
            self.errors.append("Invalid key: %s" % key)

def removeKey(self, key, group=None, locales=True):
        # set default group
        if not group:
            group = self.defaultGroup

        try:
            if locales:
                for (name, value) in self.content[group].items():
                    if re.match("^" + key + xdg.Locale.regex + "$", name) and name != key:
                        value = self.content[group][name]
                        del self.content[group][name]
            value = self.content[group][key]
            del self.content[group][key]
            self.tainted = True
            return value
        except KeyError, e:
            if debug:
                if e == group:
                    raise NoGroupError(group, self.filename)
                else:
                    raise NoKeyError(key, group, self.filename)
            else:
                return ""

def _load(self):
        "Loads comment for current language. Use get_comment() instead."
        resource = os.path.join('mime', self.media, self.subtype + '.xml')
        for path in xdg.BaseDirectory.load_data_paths(resource):
            doc = minidom.parse(path)
            if doc is None:
                continue
            for comment in doc.documentElement.getElementsByTagNameNS(FREE_NS, 'comment'):
                lang = comment.getAttributeNS(XML_NAMESPACE, 'lang') or 'en'
                goodness = 1 + (lang in xdg.Locale.langs)
                if goodness > self._comment[0]:
                    self._comment = (goodness, _get_node_data(comment))
                if goodness == 2: return

self.checkValue(key, value, list=True)
            self.warnings.append("Key '%s' is deprecated" % key)

        elif key == "Extensions":
            self.checkValue(key, value, list=True)
            self.warnings.append("Key '%s' is deprecated" % key)

        elif key == "BinaryPattern":
            self.checkValue(key, value)
            self.warnings.append("Key '%s' is deprecated" % key)

        elif key == "MapNotify":
            self.checkValue(key, value)
            self.warnings.append("Key '%s' is deprecated" % key)

        elif re.match("^SwallowTitle"+xdg.Locale.regex+"$", key):
            self.warnings.append("Key '%s' is deprecated" % key)

        elif key == "SwallowExec":
            self.checkValue(key, value)
            self.warnings.append("Key '%s' is deprecated" % key)

        elif key == "FilePattern":
            self.checkValue(key, value, type="regex", list=True)
            self.warnings.append("Key '%s' is deprecated" % key)

        elif key == "SortOrder":
            self.checkValue(key, value, list=True)
            self.warnings.append("Key '%s' is deprecated" % key)

        # "X-" extensions
        elif re.match("^X-[a-zA-Z0-9-]+", key):

def checkKey(self, key, value, group):
        # standard keys     
        if group == self.defaultGroup:
            if re.match("^Name"+xdg.Locale.regex+"$", key):
                pass
            elif re.match("^Comment"+xdg.Locale.regex+"$", key):
                pass
            elif key == "Inherits":
                self.checkValue(key, value, list=True)
            elif key == "Directories":
                self.checkValue(key, value, list=True)
            elif key == "ScaledDirectories":
                self.checkValue(key, value, list=True)
            elif key == "Hidden":
                self.checkValue(key, value, type="boolean")
            elif key == "Example":
                self.checkValue(key, value)
            elif re.match("^X-[a-zA-Z0-9-]+", key):
                pass
            else:
                self.errors.append("Invalid key: %s" % key)
        elif group in self.getDirectories():