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Internationalization
====================
nova uses `gettext <http://docs.python.org/library/gettext.html>`_ so that
user-facing strings such as log messages appear in the appropriate
language in different locales.
To use gettext, make sure that the strings passed to the logger are wrapped
in a ``_()`` function call. For example::
LOG.debug(_("block_device_mapping %s"), block_device_mapping)
Do not use ``locals()`` for formatting messages because:
1. It is not as clear as using explicit dicts.
2. It could produce hidden errors during refactoring.
3. Changing the name of a variable causes a change in the message.
4. It creates a lot of otherwise unused variables.
If you do not follow the project conventions, your code may cause the
LocalizationTestCase.test_multiple_positional_format_placeholders test to fail
in nova/tests/test_localization.py.
The ``_()`` function is brought into the global scope by doing::
from nova.openstack.common import gettextutils
gettextutils.install('nova')
These lines are needed in any toplevel script before any nova modules are
imported. If this code is missing, it may result in an error that looks like::
NameError: name '_' is not defined
The gettextutils.install() function also queries the NOVA_LOCALEDIR environment
variable to allow overriding the default localedir with a specific custom
location for Nova's message catalog.
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