Pin babel to latest version 2.3.4

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I'm pinning it to the latest version 2.3.4 for now.

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Changelog

2.3

---

(Feature release, released on April 8th)

Internal improvements

* The CLI frontend and Distutils commands use a shared implementation (https://github.com/python-babel/babel/pull/311)
* PyPy3 is supported (https://github.com/python-babel/babel/pull/343)

Features

• CLDR: Add an API for territory language data (Territory languages python-babel/babel#315)
• Core: Character order and measurement system data is imported and exposed (Character order and measurement systems python-babel/babel#368)
• Dates: Add an API for time interval formatting (Implement date interval formatting python-babel/babel#316)
• Dates: More pattern formats and lengths are supported (Additional Support for Date Time pattern formats python-babel/babel#347)
• Dates: Period IDs are imported and exposed (Day period API python-babel/babel#349)
• Dates: Support for date-time skeleton formats has been added (Add support for date-time skeletons python-babel/babel#265)
• Dates: Timezone formatting has been improved (Fix #325 Support more format for timezone python-babel/babel#338)
• Messages: JavaScript extraction now supports dotted names, ES6 template strings and JSX tags (Improved JavaScript extraction python-babel/babel#332)
• Messages: npgettext is recognized by default (Extract: Add npgettext to default keywords map python-babel/babel#341)
• Messages: The CLI learned to accept multiple domains (Frontend: Add multi-domain support to compile_catalog command python-babel/babel#335)
• Messages: The extraction commands now accept filenames in addition to directories (Support extraction by filename as well as directory python-babel/babel#324)
• Units: A new API for unit formatting is implemented (Add unit and compound unit formatting python-babel/babel#369)

Bugfixes

* Core: Mixed-case locale IDs work more reliably (https://github.com/python-babel/babel/pull/361)
* Dates: S...S formats work correctly now (https://github.com/python-babel/babel/pull/360)
* Messages: All messages are now sorted correctly if sorting has been specified (https://github.com/python-babel/babel/pull/300)
* Messages: Fix the unexpected behavior caused by catalog header updating (e0e7ef1) (https://github.com/python-babel/babel/pull/320)
* Messages: Gettext operands are now generated correctly (https://github.com/python-babel/babel/pull/295)
* Messages: Message extraction has been taught to detect encodings better (https://github.com/python-babel/babel/pull/274)



### 2.2

-----------

(Feature release, released on January 2nd 2016)

Bugfixes

• General: Add hash to Locale. (303) (2aa8074)
• General: Allow files with BOM if they're UTF-8 (189) (da87edd)
• General: localedata directory is now locale-data (109) (2d1882e)
• General: odict: Fix pop method (0a9e97e)
• General: Removed uses of datetime.date class from *.dat files (174) (94f6830)
• Messages: Fix plural selection for Chinese (531f666)
• Messages: Fix typo and add semicolon in plural_forms (5784501)
• Messages: Flatten NullTranslations.files into a list (ad11101)
• Times: FixedOffsetTimezone: fix display of negative offsets (d816803)

Features

* CLDR: Update to CLDR 28 (292) (9f7f4d0)
* General: Add __copy__ and __deepcopy__ to LazyProxy. (a1cc3f1)
* General: Add official support for Python 3.4 and 3.5
* General: Improve odict performance by making key search O(1) (6822b7f)
* Locale: Add an ordinal_form property to Locale (270) (b3f3430)
* Locale: Add support for list formatting (37ce4fa, be6e23d)
* Locale: Check inheritance exceptions first (3ef0d6d)
* Messages: Allow file locations without line numbers (279) (79bc781)
* Messages: Allow passing a callable to `extract()` (289) (3f58516)
* Messages: Support 'Language' header field of PO files (76) (3ce842b)
* Messages: Update catalog headers from templates (e0e7ef1)
* Numbers: Properly load and expose currency format types (201) (df676ab)
* Numbers: Use cdecimal by default when available (b6169be)
* Numbers: Use the CLDR's suggested number of decimals for format_currency (139) (201ed50)
* Times: Add format_timedelta(format='narrow') support (edc5eb5)



### 2.1

-----------

(Bugfix/minor feature release, released on September 25th 2015)

- Parse and honour the locale inheritance exceptions
 (https://github.com/python-babel/babel/issues/97)
- Fix Locale.parse using ``global.dat`` incompatible types 
 (https://github.com/python-babel/babel/issues/174)
- Fix display of negative offsets in ``FixedOffsetTimezone``
 (https://github.com/python-babel/babel/issues/214)
- Improved odict performance which is used during localization file
 build, should improve compilation time for large projects
- Add support for "narrow" format for ``format_timedelta``
- Add universal wheel support
- Support 'Language' header field in .PO files 
 (fixes https://github.com/python-babel/babel/issues/76)
- Test suite enhancements (coverage, broken tests fixed, etc)
- Documentation updated



### 2.0

-----------

(Released on July 27th 2015, codename Second Coming)

- Added support for looking up currencies that belong to a territory
 through the :func:`babel.numbers.get_territory_currencies`
 function.
- Improved Python 3 support.
- Fixed some broken tests for timezone behavior.
- Improved various smaller things for dealing with dates.



### 1.4

-----------

(bugfix release, release date to be decided)

- Fixed a bug that caused deprecated territory codes not being
 converted properly by the subtag resolving.  This for instance
 showed up when trying to use ``und_UK`` as a language code
 which now properly resolves to ``en_GB``.
- Fixed a bug that made it impossible to import the CLDR data
 from scratch on windows systems.



### 1.3

-----------

(bugfix release, released on July 29th 2013)

- Fixed a bug in likely-subtag resolving for some common locales.
 This primarily makes ``zh_CN`` work again which was broken
 due to how it was defined in the likely subtags combined with
 our broken resolving.  This fixes :gh:`37`.
- Fixed a bug that caused pybabel to break when writing to stdout
 on Python 3.
- Removed a stray print that was causing issues when writing to
 stdout for message catalogs.



### 1.2

-----------

(bugfix release, released on July 27th 2013)

- Included all tests in the tarball.  Previously the include
 skipped past recursive folders.
- Changed how tests are invoked and added separate standalone
 test command.  This simplifies testing of the package for
 linux distributors.



### 1.1

-----------

(bugfix release, released on July 27th 2013)

- added dummy version requirements for pytz so that it installs
 on pip 1.4.
- Included tests in the tarball.



### 1.0

-----------

(Released on July 26th 2013, codename Revival)

- support python 2.6, 2.7, 3.3+ and pypy - drop all other versions
- use tox for testing on different pythons
- Added support for the locale plural rules defined by the CLDR.
- Added `format_timedelta` function to support localized formatting of
 relative times with strings such as "2 days" or "1 month" (:trac:`126`).
- Fixed negative offset handling of Catalog._set_mime_headers (:trac:`165`).
- Fixed the case where messages containing square brackets would break with
 an unpack error.
- updated to CLDR 23
- Make the CLDR import script work with Python 2.7.
- Fix various typos.
- Sort output of list-locales.
- Make the POT-Creation-Date of the catalog being updated equal to
 POT-Creation-Date of the template used to update (:trac:`148`).
- Use a more explicit error message if no option or argument (command) is
 passed to pybabel (:trac:`81`).
- Keep the PO-Revision-Date if it is not the default value (:trac:`148`).
- Make --no-wrap work by reworking --width's default and mimic xgettext's
 behaviour of always wrapping comments (:trac:`145`).
- Add --project and --version options for commandline (:trac:`173`).
- Add a __ne__() method to the Local class.
- Explicitly sort instead of using sorted() and don't assume ordering
 (Jython compatibility).
- Removed ValueError raising for string formatting message checkers if the
 string does not contain any string formattings (:trac:`150`).
- Fix Serbian plural forms (:trac:`213`).
- Small speed improvement in format_date() (:trac:`216`).
- Fix so frontend.CommandLineInterface.run does not accumulate logging 
 handlers (:trac:`227`, reported with initial patch by dfraser)
- Fix exception if environment contains an invalid locale setting
 (:trac:`200`)
- use cPickle instead of pickle for better performance (:trac:`225`)
- Only use bankers round algorithm as a tie breaker if there are two nearest
 numbers, round as usual if there is only one nearest number (:trac:`267`,
 patch by Martin)
- Allow disabling cache behaviour in LazyProxy (:trac:`208`, initial patch
 from Pedro Algarvio)
- Support for context-aware methods during message extraction (:trac:`229`,
 patch from David Rios)
- "init" and "update" commands support "--no-wrap" option (:trac:`289`)
- fix formatting of fraction in format_decimal() if the input value is a float
 with more than 7 significant digits (:trac:`183`)
- fix format_date() with datetime parameter (:trac:`282`, patch from Xavier
 Morel)
- fix format_decimal() with small Decimal values (:trac:`214`, patch from
 George Lund)
- fix handling of messages containing '\\n' (:trac:`198`)
- handle irregular multi-line msgstr (no "" as first line) gracefully
 (:trac:`171`)
- parse_decimal() now returns Decimals not floats, API change (:trac:`178`)
- no warnings when running setup.py without installed setuptools (:trac:`262`)
- modified Locale.__eq__ method so Locales are only equal if all of their
 attributes (language, territory, script, variant) are equal
- resort to hard-coded message extractors/checkers if pkg_resources is
 installed but no egg-info was found (:trac:`230`)
- format_time() and format_datetime() now accept also floats (:trac:`242`)
- add babel.support.NullTranslations class similar to gettext.NullTranslations
 but with all of Babel's new gettext methods (:trac:`277`)
- "init" and "update" commands support "--width" option (:trac:`284`)
- fix 'input_dirs' option for setuptools integration (:trac:`232`, initial
 patch by Étienne Bersac)
- ensure .mo file header contains the same information as the source .po file
 (:trac:`199`)
- added support for get_language_name() on the locale objects.
- added support for get_territory_name() on the locale objects.
- added support for get_script_name() on the locale objects.
- added pluralization support for currency names and added a '¤¤¤'
 pattern for currencies that includes the full name.
- depend on pytz now and wrap it nicer.  This gives us improved support
 for things like timezone transitions and an overall nicer API.
- Added support for explicit charset to PO file reading.
- Added experimental Python 3 support.
- Added better support for returning timezone names.
- Don't throw away a Catalog's obsolete messages when updating it.
- Added basic likelySubtag resolving when doing locale parsing and no
 match can be found.




### 0.9.6

-------------

(released on March 17th 2011)

- Backport r493-494: documentation typo fixes.
- Make the CLDR import script work with Python 2.7.
- Fix various typos.
- Fixed Python 2.3 compatibility (:trac:`146`, :trac:`233`).
- Sort output of list-locales.
- Make the POT-Creation-Date of the catalog being updated equal to
 POT-Creation-Date of the template used to update (:trac:`148`).
- Use a more explicit error message if no option or argument (command) is
 passed to pybabel (:trac:`81`).
- Keep the PO-Revision-Date if it is not the default value (:trac:`148`).
- Make --no-wrap work by reworking --width's default and mimic xgettext's
 behaviour of always wrapping comments (:trac:`145`).
- Fixed negative offset handling of Catalog._set_mime_headers (:trac:`165`).
- Add --project and --version options for commandline (:trac:`173`).
- Add a __ne__() method to the Local class.
- Explicitly sort instead of using sorted() and don't assume ordering
 (Python 2.3 and Jython compatibility).
- Removed ValueError raising for string formatting message checkers if the
 string does not contain any string formattings (:trac:`150`).
- Fix Serbian plural forms (:trac:`213`).
- Small speed improvement in format_date() (:trac:`216`).
- Fix number formatting for locales where CLDR specifies alt or draft 
 items (:trac:`217`)
- Fix bad check in format_time (:trac:`257`, reported with patch and tests by
 jomae)
- Fix so frontend.CommandLineInterface.run does not accumulate logging 
 handlers (:trac:`227`, reported with initial patch by dfraser)
- Fix exception if environment contains an invalid locale setting
 (:trac:`200`)




### 0.9.5

-------------

(released on April 6th 2010)

- Fixed the case where messages containing square brackets would break with
 an unpack error.
- Backport of r467: Fuzzy matching regarding plurals should *NOT* be checked
 against len(message.id)  because this is always 2, instead, it's should be
 checked against catalog.num_plurals (:trac:`212`).




### 0.9.4

-------------

(released on August 25th 2008)

- Currency symbol definitions that is defined with choice patterns in the
 CLDR data are no longer imported, so the symbol code will be used instead.
- Fixed quarter support in date formatting.
- Fixed a serious memory leak that was introduces by the support for CLDR
 aliases in 0.9.3 (:trac:`128`).
- Locale modifiers such as "euro" are now stripped from locale identifiers
 when parsing (:trac:`136`).
- The system locales "C" and "POSIX" are now treated as aliases for
 "en_US_POSIX", for which the CLDR provides the appropriate data. Thanks to
 Manlio Perillo for the suggestion.
- Fixed JavaScript extraction for regular expression literals (:trac:`138`)
 and concatenated strings.
- The `Translation` class in `babel.support` can now manage catalogs with
 different message domains, and exposes the family of `d*gettext` functions
 (:trac:`137`).




### 0.9.3

-------------

(released on July 9th 2008)

- Fixed invalid message extraction methods causing an UnboundLocalError.
- Extraction method specification can now use a dot instead of the colon to
 separate module and function name (:trac:`105`).
- Fixed message catalog compilation for locales with more than two plural
 forms (:trac:`95`).
- Fixed compilation of message catalogs for locales with more than two plural
 forms where the translations were empty (:trac:`97`).
- The stripping of the comment tags in comments is optional now and
 is done for each line in a comment.
- Added a JavaScript message extractor.
- Updated to CLDR 1.6.
- Fixed timezone calculations when formatting datetime and time values.
- Added a `get_plural` function into the plurals module that returns the
 correct plural forms for a locale as tuple.
- Added support for alias definitions in the CLDR data files, meaning that
 the chance for items missing in certain locales should be greatly reduced
 (:trac:`68`).




### 0.9.2

-------------

(released on February 4th 2008)

- Fixed catalogs' charset values not being recognized (:trac:`66`).
- Numerous improvements to the default plural forms.
- Fixed fuzzy matching when updating message catalogs (:trac:`82`).
- Fixed bug in catalog updating, that in some cases pulled in translations
 from different catalogs based on the same template.
- Location lines in PO files do no longer get wrapped at hyphens in file
 names (:trac:`79`).
- Fixed division by zero error in catalog compilation on empty catalogs
 (:trac:`60`).




### 0.9.1

-------------

(released on September 7th 2007)

- Fixed catalog updating when a message is merged that was previously simple
 but now has a plural form, for example by moving from `gettext` to
 `ngettext`, or vice versa.
- Fixed time formatting for 12 am and 12 pm.
- Fixed output encoding of the `pybabel --list-locales` command.
- MO files are now written in binary mode on windows (:trac:`61`).




### 0.9

-----------

(released on August 20th 2007)

- The `new_catalog` distutils command has been renamed to `init_catalog` for
 consistency with the command-line frontend.
- Added compilation of message catalogs to MO files (:trac:`21`).
- Added updating of message catalogs from POT files (:trac:`22`).
- Support for significant digits in number formatting.
- Apply proper "banker's rounding" in number formatting in a cross-platform
 manner.
- The number formatting functions now also work with numbers represented by
 Python `Decimal` objects (:trac:`53`).
- Added extensible infrastructure for validating translation catalogs.
- Fixed the extractor not filtering out messages that didn't validate against
 the keyword's specification (:trac:`39`).
- Fixed the extractor raising an exception when encountering an empty string
 msgid. It now emits a warning to stderr.
- Numerous Python message extractor fixes: it now handles nested function
 calls within a gettext function call correctly, uses the correct line number
 for multi-line function calls, and other small fixes (tickets :trac:`38` and
 :trac:`39`).
- Improved support for detecting Python string formatting fields in message
 strings (:trac:`57`).
- CLDR upgraded to the 1.5 release.
- Improved timezone formatting.
- Implemented scientific number formatting.
- Added mechanism to lookup locales by alias, for cases where browsers insist
 on including only the language code in the `Accept-Language` header, and
 sometimes even the incorrect language code.




### 0.8.1

-------------

(released on July 2nd 2007)

- `default_locale()` would fail when the value of the `LANGUAGE` environment
 variable contained multiple language codes separated by colon, as is
 explicitly allowed by the GNU gettext tools. As the `default_locale()`
 function is called at the module level in some modules, this bug would
 completely break importing these modules on systems where `LANGUAGE` is set
 that way.
- The character set specified in PO template files is now respected when
 creating new catalog files based on that template. This allows the use of
 characters outside the ASCII range in POT files (:trac:`17`).
- The default ordering of messages in generated POT files, which is based on
 the order those messages are found when walking the source tree, is no
 longer subject to differences between platforms; directory and file names
 are now always sorted alphabetically.
- The Python message extractor now respects the special encoding comment to be
 able to handle files containing non-ASCII characters (:trac:`23`).
- Added ``N_`` (gettext noop) to the extractor's default keywords.
- Made locale string parsing more robust, and also take the script part into
 account (:trac:`27`).
- Added a function to list all locales for which locale data is available.
- Added a command-line option to the `pybabel` command which prints out all
 available locales (:trac:`24`).
- The name of the command-line script has been changed from just `babel` to
 `pybabel` to avoid a conflict with the OpenBabel project (:trac:`34`).




### 0.8

-----------

(released on June 20th 2007)

- First public release

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