How to use the portage.localization._ function in portage

def validate(self):
		"""Validate miscellaneous settings and display warnings if necessary.
		(This code was previously in the global scope of portage.py)"""

		groups = self.get("ACCEPT_KEYWORDS", "").split()
		archlist = self.archlist()
		if not archlist:
			writemsg(_("--- 'profiles/arch.list' is empty or "
				"not available. Empty ebuild repository?\n"), noiselevel=1)
		else:
			for group in groups:
				if group not in archlist and \
					not (group.startswith("-") and group[1:] in archlist) and \
					group not in ("*", "~*", "**"):
					writemsg(_("!!! INVALID ACCEPT_KEYWORDS: %s\n") % str(group),
						noiselevel=-1)

		profile_broken = False

		# getmaskingstatus requires ARCH for ACCEPT_KEYWORDS support
		arch = self.get('ARCH')
		if not self.profile_path or not arch:
			profile_broken = True
		else:
			# If any one of these files exists, then
			# the profile is considered valid.
			for x in ("make.defaults", "parent",
				"packages", "use.force", "use.mask"):
				if exists_raise_eaccess(os.path.join(self.profile_path, x)):
					break
			else:

# start with either 'ro' or 'rw'
				# example line:
				# 14 1 8:3 / / rw,noatime - ext3 /dev/root rw,errors=continue,commit=5,barrier=1,data=writeback
				#       _dir ^ ^ attr1                     ^ attr2
				# there can be a variable number of fields
				# to the left of the ' - ', after the attr's, so split it there
				mount = line.split(' - ', 1)
				_dir, attr1 = mount[0].split()[4:6]
				attr2 = mount[1].split()[2]
				if attr1.startswith('ro') or attr2.startswith('ro'):
					ro_filesystems.add(_dir)

	# If /proc/self/mountinfo can't be read, assume that there are no RO
	# filesystems and return.
	except EnvironmentError:
		writemsg_level(_("!!! /proc/self/mountinfo cannot be read"),
			level=logging.WARNING, noiselevel=-1)
		return []

	ro_devs = {}
	for x in ro_filesystems:
		try:
			ro_devs[os.stat(x).st_dev] = x
		except OSError:
			pass

	ro_filesystems.clear()
	for x in set(dir_list):
		try:
			dev = os.stat(x).st_dev
		except OSError:
			pass

" detected in '%s'\n") % group_name, noiselevel=-1)
			rValue.append("@"+group_name)
		elif license_group:
			traversed_groups.add(group_name)
			for l in license_group:
				if l.startswith("-"):
					writemsg(_("Skipping invalid element %s"
						" in license group '%s'\n") % (l, group_name),
						noiselevel=-1)
				else:
					rValue.extend(self._expandLicenseToken(l, traversed_groups))
		else:
			if self._license_groups and \
				group_name not in self._undef_lic_groups:
				self._undef_lic_groups.add(group_name)
				writemsg(_("Undefined license group '%s'\n") % group_name,
					noiselevel=-1)
			rValue.append("@"+group_name)
		if negate:
			rValue = ["-" + token for token in rValue]
		return rValue

break

	renamefailed = 1
	if hardlinked:
		renamefailed = False
	if not hardlinked and (selinux_enabled or sstat.st_dev == dstat.st_dev):
		try:
			if selinux_enabled:
				selinux.rename(src, dest)
			else:
				os.rename(src, dest)
			renamefailed = 0
		except OSError as e:
			if e.errno != errno.EXDEV:
				# Some random error.
				writemsg("!!! %s\n" % _("Failed to move %(src)s to %(dest)s") %
					{"src": src, "dest": dest}, noiselevel=-1)
				writemsg("!!! %s\n" % (e,), noiselevel=-1)
				return None
			# Invalid cross-device-link 'bind' mounted or actually Cross-Device
	if renamefailed:
		if stat.S_ISREG(sstat[stat.ST_MODE]):
			dest_tmp = dest + "#new"
			dest_tmp_bytes = _unicode_encode(dest_tmp, encoding=encoding,
				errors='strict')
			try: # For safety copy then move it over.
				_copyfile(src_bytes, dest_tmp_bytes)
				_apply_stat(sstat, dest_tmp_bytes)
				if xattr_enabled:
					try:
						_copyxattr(src_bytes, dest_tmp_bytes,
							exclude=mysettings.get("PORTAGE_XATTR_EXCLUDE", ""))

os.path.dirname(os.path.dirname(pkgdir)))
		mf = mf.load_manifest(pkgdir, mysettings["DISTDIR"])
	eout = EOutput()
	eout.quiet = mysettings.get("PORTAGE_QUIET", None) == "1"
	try:
		if not mf.thin and strict and "PORTAGE_PARALLEL_FETCHONLY" not in mysettings:
			if mf.fhashdict.get("EBUILD"):
				eout.ebegin(_("checking ebuild checksums ;-)"))
				mf.checkTypeHashes("EBUILD", hash_filter=hash_filter)
				eout.eend(0)
			if mf.fhashdict.get("AUX"):
				eout.ebegin(_("checking auxfile checksums ;-)"))
				mf.checkTypeHashes("AUX", hash_filter=hash_filter)
				eout.eend(0)
			if mf.strict_misc_digests and mf.fhashdict.get("MISC"):
				eout.ebegin(_("checking miscfile checksums ;-)"))
				mf.checkTypeHashes("MISC", ignoreMissingFiles=True,
					hash_filter=hash_filter)
				eout.eend(0)
		for f in myfiles:
			eout.ebegin(_("checking %s ;-)") % f)
			ftype = mf.findFile(f)
			if ftype is None:
				if mf.allow_missing:
					continue
				eout.eend(1)
				writemsg(_("\n!!! Missing digest for '%s'\n") % (f,),
					noiselevel=-1)
				return 0
			mf.checkFileHashes(ftype, f, hash_filter=hash_filter)
			eout.eend(0)
	except FileNotFound as e:

try:
			f = open(_unicode_encode(self._aux_cache_filename,
				encoding=_encodings['fs'], errors='strict'),
				mode='rb', **open_kwargs)
			mypickle = pickle.Unpickler(f)
			try:
				mypickle.find_global = None
			except AttributeError:
				# TODO: If py3k, override Unpickler.find_class().
				pass
			aux_cache = mypickle.load()
			f.close()
			del f
		except (IOError, OSError, EOFError, ValueError, pickle.UnpicklingError) as e:
			if isinstance(e, pickle.UnpicklingError):
				writemsg(_("!!! Error loading '%s': %s\n") % \
					(self._aux_cache_filename, str(e)), noiselevel=-1)
			del e

		if not aux_cache or \
			not isinstance(aux_cache, dict) or \
			aux_cache.get("version") != self._aux_cache_version or \
			not aux_cache.get("packages"):
			aux_cache = {"version": self._aux_cache_version}
			aux_cache["packages"] = {}

		owners = aux_cache.get("owners")
		if owners is not None:
			if not isinstance(owners, dict):
				owners = None
			elif "version" not in owners:
				owners = None

except OSError:
				pass

			make_conf_count = 0
			make_conf = {}
			for x in make_conf_paths:
				mygcfg = getconfig(x,
					tolerant=tolerant, allow_sourcing=True,
					expand=make_conf, recursive=True)
				if mygcfg is not None:
					make_conf.update(mygcfg)
					make_conf_count += 1

			if make_conf_count == 2:
				writemsg("!!! %s\n" %
					_("Found 2 make.conf files, using both '%s' and '%s'") %
					tuple(make_conf_paths), noiselevel=-1)

			# Allow ROOT setting to come from make.conf if it's not overridden
			# by the constructor argument (from the calling environment).
			locations_manager.set_root_override(make_conf.get("ROOT"))
			target_root = locations_manager.target_root
			eroot = locations_manager.eroot
			self.global_config_path = locations_manager.global_config_path

			# The expand_map is used for variable substitution
			# in getconfig() calls, and the getconfig() calls
			# update expand_map with the value of each variable
			# assignment that occurs. Variable substitution occurs
			# in the following order, which corresponds to the
			# order of appearance in self.lookuplist:
			#

except NoOptionError:
					setname = sname
				if setname in self.psets and not update:
					self.errors.append(_("Redefinition of set '%s' (sections: '%s', '%s')") % (setname, self.psets[setname].creator, sname))
				if hasattr(setclass, "singleBuilder"):
					try:
						self.psets[setname] = setclass.singleBuilder(optdict, self.settings, self.trees)
						self.psets[setname].creator = sname
						if parser.has_option(sname, "world-candidate") and \
							parser.getboolean(sname, "world-candidate"):
							self.psets[setname].world_candidate = True
					except SetConfigError as e:
						self.errors.append(_("Configuration error in section '%s': %s") % (sname, str(e)))
						continue
				else:
					self.errors.append(_("'%(class)s' does not support individual set creation, section '%(section)s' "
						"must be configured as multiset") % {"class": classname, "section": sname})
					continue
		self._parsed = True

ldconfig = os.path.join(eroot, "sbin", "ldconfig")

	if ldconfig is None:
		pass
	elif not (os.access(ldconfig, os.X_OK) and os.path.isfile(ldconfig)):
		ldconfig = None

	# Only run ldconfig as needed
	if makelinks and ldconfig:
		# ldconfig has very different behaviour between FreeBSD and Linux
		if ostype == "Linux" or ostype.lower().endswith("gnu"):
			# We can't update links if we haven't cleaned other versions first, as
			# an older package installed ON TOP of a newer version will cause ldconfig
			# to overwrite the symlinks we just made. -X means no links. After 'clean'
			# we can safely create links.
			writemsg_level(_(">>> Regenerating %setc/ld.so.cache...\n") % \
				(target_root,))
			os.system("cd / ; %s -X -r '%s'" % (ldconfig, target_root))
		elif ostype in ("FreeBSD", "DragonFly"):
			writemsg_level(_(">>> Regenerating %svar/run/ld-elf.so.hints...\n") % \
				target_root)
			os.system(("cd / ; %s -elf -i " + \
				"-f '%svar/run/ld-elf.so.hints' '%setc/ld.so.conf'") % \
				(ldconfig, target_root, target_root))

	del specials["LDPATH"]

	penvnotice  = "# THIS FILE IS AUTOMATICALLY GENERATED BY env-update.\n"
	penvnotice += "# DO NOT EDIT THIS FILE. CHANGES TO STARTUP PROFILES\n"
	cenvnotice  = penvnotice[:]
	penvnotice += "# GO INTO /etc/profile NOT /etc/profile.env\n\n"
	cenvnotice += "# GO INTO /etc/csh.cshrc NOT /etc/csh.env\n\n"

# in order to conserve memory.
		frozensets = {}
		owner_entries = collections.defaultdict(list)

		while True:
			try:
				owner, location, l = lines.pop()
			except IndexError:
				break
			l = l.rstrip("\n")
			if not l:
				continue
			if '\0' in l:
				# os.stat() will raise "TypeError: must be encoded string
				# without NULL bytes, not str" in this case.
				writemsg_level(_("\nLine contains null byte(s) " \
					"in %s: %s\n\n") % (location, l),
					level=logging.ERROR, noiselevel=-1)
				continue
			try:
				entry = NeededEntry.parse(location, l)
			except InvalidData as e:
				writemsg_level("\n%s\n\n" % (e,),
					level=logging.ERROR, noiselevel=-1)
				continue

			# If NEEDED.ELF.2 contains the new multilib category field,
			# then use that for categorization. Otherwise, if a mapping
			# exists, map e_machine (entry.arch) to an approximate
			# multilib category. If all else fails, use e_machine, just
			# as older versions of portage did.
			if entry.multilib_category is None: