Merge pull request #1868 from MITx/feature/i18n

Feature/i18n

.gitignore

@@ -31,3 +31,13 @@ cover_html/
 chromedriver.log
 /nbproject
 ghostdriver.log
+/cms/doc/en/getting_started/
+/conf/locale/en
+/conf/locale/fr
+create-dev-env.hack.sh
+distribute-0.6.36.tar.gz
+i18n/googleTranslate.hack.py
+i18n/mitx/conf/locale/fr/LC_MESSAGES/django.po
+i18n/split.py
+.gitignore
+

cms/djangoapps/contentstore/tests/test_i18n.py

+from unittest import skip
+
+from django.core.urlresolvers import reverse
+from django.contrib.auth.models import User
+from django.test.client import Client
+
+from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+
+class InternationalizationTest(ModuleStoreTestCase):
+    """
+    Tests to validate Internationalization.
+    """
+
+    def setUp(self):
+        """
+        These tests need a user in the DB so that the django Test Client
+        can log them in.
+        They inherit from the ModuleStoreTestCase class so that the mongodb collection
+        will be cleared out before each test case execution and deleted
+        afterwards.
+        """
+        self.uname = 'testuser'
+        self.email = 'test+courses@edx.org'
+        self.password = 'foo'
+
+        # Create the use so we can log them in.
+        self.user = User.objects.create_user(self.uname, self.email, self.password)
+
+        # Note that we do not actually need to do anything
+        # for registration if we directly mark them active.
+        self.user.is_active = True
+        # Staff has access to view all courses
+        self.user.is_staff = True
+        self.user.save()
+
+        self.course_data = {
+            'template': 'i4x://edx/templates/course/Empty',
+            'org': 'MITx',
+            'number': '999',
+            'display_name': 'Robot Super Course',
+            }
+
+    def test_course_plain_english(self):
+        """Test viewing the index page with no courses"""
+        self.client = Client()
+        self.client.login(username=self.uname, password=self.password)
+        
+        resp = self.client.get(reverse('index'))
+        self.assertContains(resp,
+            '<h1 class="title-1">My Courses</h1>',
+            status_code=200,
+            html=True)
+
+    def test_course_explicit_english(self):
+        """Test viewing the index page with no courses"""
+        self.client = Client()
+        self.client.login(username=self.uname, password=self.password)
+        
+        resp = self.client.get(reverse('index'),
+                               {},
+                               HTTP_ACCEPT_LANGUAGE='en'
+                               )
+
+        self.assertContains(resp,
+            '<h1 class="title-1">My Courses</h1>',
+            status_code=200,
+            html=True)        
+
+
+    # ****
+    # NOTE:
+    # ****
+    #
+    # This test will break when we replace this fake 'test' language
+    # with actual French. This test will need to be updated with
+    # actual French at that time.
+    
+    # Test temporarily disable since it depends on creation of dummy strings
+    @skip
+    def test_course_with_accents (self):
+        """Test viewing the index page with no courses"""
+        self.client = Client()
+        self.client.login(username=self.uname, password=self.password)
+        
+        resp = self.client.get(reverse('index'),
+                               {},
+                               HTTP_ACCEPT_LANGUAGE='fr'
+                               )
+
+        TEST_STRING = u'<h1 class="title-1">' \
+                      + u'My \xc7\xf6\xfcrs\xe9s L#' \
+                      + u'</h1>'
+        
+        self.assertContains(resp,
+                            TEST_STRING,
+                            status_code=200,
+                            html=True)        

cms/envs/common.py

@@ -129,6 +129,9 @@ MIDDLEWARE_CLASSES = (
     'track.middleware.TrackMiddleware',
     'mitxmako.middleware.MakoMiddleware',
 
+    # Detects user-requested locale from 'accept-language' header in http request
+    'django.middleware.locale.LocaleMiddleware',
+
     'django.middleware.transaction.TransactionMiddleware'
 )
 
@@ -173,9 +176,13 @@ STATICFILES_DIRS = [
 # Locale/Internationalization
 TIME_ZONE = 'America/New_York'  # http://en.wikipedia.org/wiki/List_of_tz_zones_by_name
 LANGUAGE_CODE = 'en'            # http://www.i18nguy.com/unicode/language-identifiers.html
+
 USE_I18N = True
 USE_L10N = True
 
+# Localization strings (e.g. django.po) are under this directory
+LOCALE_PATHS = (REPO_ROOT + '/conf/locale',)  # mitx/conf/locale/
+
 # Tracking
 TRACK_MAX_EVENT = 10000
 

cms/static/js/base.js

@@ -245,7 +245,7 @@ function showImportSubmit(e) {
         $('.submit-button').show();
         $('.progress').show();
     } else {
-        $('.error-block').html('File format not supported. Please upload a file with a <code>tar.gz</code> extension.').show();
+        $('.error-block').html(gettext('File format not supported. Please upload a file with a <code>tar.gz</code> extension.')).show();
     }
 }
 
@@ -406,7 +406,7 @@ function showFileSelectionMenu(e) {
 }
 
 function startUpload(e) {
-    $('.upload-modal h1').html('Uploading…');
+    $('.upload-modal h1').html(gettext('Uploading…'));
     $('.upload-modal .file-name').html($('.file-input').val().replace('C:\\fakepath\\', ''));
     $('.upload-modal .file-chooser').ajaxSubmit({
         beforeSend: resetUploadBar,
@@ -439,7 +439,7 @@ function displayFinishedUpload(xhr) {
     $('.upload-modal .embeddable').show();
     $('.upload-modal .file-name').hide();
     $('.upload-modal .progress-fill').html(resp.msg);
-    $('.upload-modal .choose-file-button').html('Load Another File').show();
+    $('.upload-modal .choose-file-button').html(gettext('Load Another File')).show();
     $('.upload-modal .progress-fill').width('100%');
 
     // see if this id already exists, if so, then user must have updated an existing piece of content
@@ -500,11 +500,11 @@ function toggleSock(e) {
     });
 
     if($sock.hasClass('is-shown')) {
-        $btnLabel.text('Hide Studio Help');
+        $btnLabel.text(gettext('Hide Studio Help'));
     }
 
     else {
-        $btnLabel.text('Looking for Help with Studio?');
+        $btnLabel.text(gettext('Looking for Help with Studio?'));
     }
 }
 
@@ -845,7 +845,15 @@ function saveSetSectionScheduleDate(e) {
         data: JSON.stringify({ 'id': id, 'metadata': {'start': start}})
     }).success(function () {
             var $thisSection = $('.courseware-section[data-id="' + id + '"]');
-            $thisSection.find('.section-published-date').html('<span class="published-status"><strong>Will Release:</strong> ' + input_date + ' at ' + input_time + ' UTC</span><a href="#" class="edit-button" data-date="' + input_date + '" data-time="' + input_time + '" data-id="' + id + '">Edit</a>');
+  	    var format = gettext('<strong>Will Release:</strong> %(date)s at $(time)s UTC');
+            var willReleaseAt = interpolate(format, [input_date, input_time], true);
+            $thisSection.find('.section-published-date').html(
+	      '<span class="published-status">' + willReleaseAt + '</span>' +
+	      '<a href="#" class="edit-button" ' +
+		'" data-date="' + input_date +
+		'" data-time="' + input_time +
+		'" data-id="' + id + '">' +
+		gettext('Edit') + '</a>');
             $thisSection.find('.section-published-date').animate({
                 'background-color': 'rgb(182,37,104)'
             }, 300).animate({

cms/templates/base.html

@@ -30,6 +30,7 @@
 
   <body class="<%block name='bodyclass'></%block> hide-wip">
     <%include file="courseware_vendor_js.html"/>
+    <script type="text/javascript" src="${static.url('jsi18n/')}"></script>
     <script type="text/javascript" src="${static.url('js/vendor/json2.js')}"></script>
     <script type="text/javascript" src="${static.url('js/vendor/underscore-min.js')}"></script>
     <script type="text/javascript" src="${static.url('js/vendor/backbone-min.js')}"></script>

cms/templates/index.html

+<%! from django.utils.translation import ugettext as _ %>
+
 <%inherit file="base.html" />
 
-<%block name="title">My Courses</%block>
+<%block name="title">${_("My Courses")}</%block>
 <%block name="bodyclass">is-signedin index dashboard</%block>
 
 <%block name="header_extras">
@@ -36,18 +38,18 @@
   <div class="wrapper-mast wrapper">
     <header class="mast has-actions">
       <div  class="title">
-        <h1 class="title-1">My Courses</h1>
+        <h1 class="title-1">${_("My Courses")}</h1>
       </div>
 
       % if user.is_active:
       <nav class="nav-actions">
-        <h3 class="sr">Page Actions</h3>
+        <h3 class="sr">${_("Page Actions")}</h3>
         <ul>
           <li class="nav-item">
             % if not disable_course_creation:
-              <a href="#" class="button new-button new-course-button"><i class="ss-icon ss-symbolicons-standard icon icon-create">&#x002B;</i> New Course</a>
+              <a href="#" class="button new-button new-course-button"><i class="ss-icon ss-symbolicons-standard icon icon-create">&#x002B;</i> ${_("New Course")}</a>
 	    % elif settings.MITX_FEATURES.get('STAFF_EMAIL',''):
-	      <a href="mailto:${settings.MITX_FEATURES.get('STAFF_EMAIL','')}">Email staff to create course</a>
+	      <a href="mailto:${settings.MITX_FEATURES.get('STAFF_EMAIL','')}">${_("Email staff to create course")}</a>
             % endif
           </li>
         </ul>
@@ -59,7 +61,9 @@
   <div class="wrapper-content wrapper">
     <section class="content">
       <div class="introduction">
-        <p class="copy"><strong>Welcome, ${ user.username }</strong>. Here are all of the courses you are currently authoring in Studio:</p>
+        <p class="copy">
+          <strong>${_("Welcome, %(name)s") % dict(name= user.username)}</strong>.
+          ${_("Here are all of the courses you are currently authoring in Studio:")}</p>
       </div>
     </section>
   </div>
@@ -81,11 +85,11 @@
         % else:
           <div class='warn-msg'>
             <p>
-            In order to start authoring courses using edX Studio, please click on the activation link in your email.
+            ${_("In order to start authoring courses using edX Studio, please click on the activation link in your email.")}
             </p>
           </div>
         % endif
       </article>
     </div>
   </div>
-</%block>
+</%block>
\ No newline at end of file

cms/templates/widgets/footer.html

 <%! from django.core.urlresolvers import reverse %>
+<%! from django.utils.translation import ugettext as _ %>
+
 <div class="wrapper-footer wrapper">  
   <footer class="primary" role="contentinfo">
     <div class="colophon">
-      <p>&copy; 2013 <a href="http://www.edx.org" rel="external">edX</a>. All rights reserved.</p>
+      <p>&copy; 2013 <a href="http://www.edx.org" rel="external">edX</a>. ${ _("All rights reserved.")}</p>
     </div>
     
     <nav class="nav-peripheral">
@@ -15,10 +17,11 @@
         </li> -->
         % if user.is_authenticated():
         <li class="nav-item nav-peripheral-feedback">
-          <a href="http://help.edge.edx.org/discussion/new" class="show-tender" title="Use our feedback tool, Tender, to share your feedback">Contact Us</a>
+          <a href="http://help.edge.edx.org/discussion/new" class="show-tender" title="${_('Use our feedback tool, Tender, to share your feedback')}">${_("Contact Us")}</a>
         </li>
         % endif    
       </ol>
     </nav>
   </footer>
-</div>
+</div>
\ No newline at end of file
+

cms/urls.py

@@ -120,6 +120,17 @@ urlpatterns += (
     url(r'^ux-alerts$', 'contentstore.views.ux_alerts', name='ux-alerts')
     )
 
+js_info_dict = {
+    'domain': 'djangojs',
+    'packages': ('cms',),
+    }
+
+urlpatterns += (
+    # Serve catalog of localized strings to be rendered by Javascript
+    url(r'^jsi18n/$', 'django.views.i18n.javascript_catalog', js_info_dict),
+    )
+
+
 if settings.ENABLE_JASMINE:
     # # Jasmine
     urlpatterns = urlpatterns + (url(r'^_jasmine/', include('django_jasmine.urls')),)

conf/locale/babel.cfg

+# Extraction from Python source files
+#[python: cms/**.py]
+#[python: lms/**.py]
+#[python: common/**.py]
+
+# Extraction from Javscript source files
+#[javascript: cms/**.js]
+#[javascript: lms/**.js]
+#[javascript: common/static/js/capa/**.js]
+#[javascript: common/static/js/course_groups/**.js]
+# do not extract from common/static/js/vendor/**
+
+# Extraction from Mako templates
+[mako: cms/templates/**.html]
+input_encoding = utf-8
+[mako: lms/templates/**.html]
+input_encoding = utf-8
+[mako: common/templates/**.html]
+input_encoding = utf-8

conf/locale/config

+{"locales" : ["en", "fr", "de"]}

i18n/converter.py

+import re
+import itertools
+
+class Converter:
+    """Converter is an abstract class that transforms strings.
+       It hides embedded tags (HTML or Python sequences) from transformation
+  
+       To implement Converter, provide implementation for inner_convert_string()
+
+       Strategy:
+         1. extract tags embedded in the string
+           a. use the index of each extracted tag to re-insert it later
+           b. replace tags in string with numbers (<0>, <1>, etc.)
+           c. save extracted tags in a separate list
+         2. convert string
+         3. re-insert the extracted tags
+
+    """
+    
+    # matches tags like these:
+    #   HTML:   <B>, </B>, <BR/>, <textformat leading="10">
+    #   Python: %(date)s, %(name)s
+    tag_pattern = re.compile(r'(<[-\w" .:?=/]*>)|({[^}]*})|(%\([^)]*\)\w)', re.I)
+
+    def convert(self, string):
+        """Returns: a converted tagged string
+           param: string (contains html tags)
+    
+           Don't replace characters inside tags
+        """
+        (string, tags) = self.detag_string(string)
+        string = self.inner_convert_string(string)
+        string = self.retag_string(string, tags)
+        return string
+
+    def detag_string(self, string):
+        """Extracts tags from string.
+        
+           returns (string, list) where
+           string: string has tags replaced by indices (<BR>... => <0>, <1>, <2>, etc.)
+           list: list of the removed tags ('<BR>', '<I>', '</I>')
+        """
+        counter = itertools.count(0)
+        count = lambda m: '<%s>' % counter.next()
+        tags = self.tag_pattern.findall(string)
+        tags = [''.join(tag) for tag in tags]
+        (new, nfound) = self.tag_pattern.subn(count, string)
+        if len(tags) != nfound:
+            raise Exception('tags dont match:'+string)
+        return (new, tags)
+
+    def retag_string(self, string, tags):
+        """substitutes each tag back into string, into occurrences of <0>, <1> etc"""
+        for (i, tag) in enumerate(tags):
+            p = '<%s>' % i
+            string = re.sub(p, tag, string, 1)
+        return string
+
+
+    # ------------------------------
+    # Customize this in subclasses of Converter
+
+    def inner_convert_string(self, string):
+        return string  # do nothing by default
+

i18n/dummy.py

+from converter import Converter
+
+# Creates new localization properties files in a dummy language
+# Each property file is derived from the equivalent en_US file, except
+# 1. Every vowel is replaced with an equivalent with extra accent marks
+# 2. Every string is padded out to +30% length to simulate verbose languages (e.g. German)
+#    to see if layout and flows work properly
+# 3. Every string is terminated with a '#' character to make it easier to detect truncation
+
+
+# --------------------------------
+# Example use:
+# >>> from dummy import Dummy
+# >>> c = Dummy()
+# >>> c.convert("hello my name is Bond, James Bond")
+# u'h\xe9ll\xf6 my n\xe4m\xe9 \xefs B\xf6nd, J\xe4m\xe9s B\xf6nd Lorem i#'
+#
+# >>> c.convert('don\'t convert <a href="href">tag ids</a>')
+# u'd\xf6n\'t \xe7\xf6nv\xe9rt <a href="href">t\xe4g \xefds</a> Lorem ipsu#'
+#
+# >>> c.convert('don\'t convert %(name)s tags on %(date)s')
+# u"d\xf6n't \xe7\xf6nv\xe9rt %(name)s t\xe4gs \xf6n %(date)s Lorem ips#"
+
+
+# Substitute plain characters with accented lookalikes.
+# http://tlt.its.psu.edu/suggestions/international/web/codehtml.html#accent
+TABLE = {'A': u'\xC0',
+         'a': u'\xE4',
+         'b': u'\xDF',
+         'C': u'\xc7',
+         'c': u'\xE7',
+         'E': u'\xC9',
+         'e': u'\xE9',
+         'I': U'\xCC',
+         'i': u'\xEF',
+         'O': u'\xD8',
+         'o': u'\xF6',
+         'u': u'\xFC'
+         }
+
+
+
+# The print industry's standard dummy text, in use since the 1500s
+# see http://www.lipsum.com/
+LOREM = ' Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed ' \
+        'do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad ' \
+        'minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ' \
+        'ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate ' \
+        'velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat ' \
+        'cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. '
+
+# To simulate more verbose languages (like German), pad the length of a string
+# by a multiple of PAD_FACTOR
+PAD_FACTOR = 1.3
+
+
+class Dummy (Converter):
+    """
+    A string converter that generates dummy strings with fake accents
+    and lorem ipsum padding.
+    """
+
+    def convert(self, string):
+        result = Converter.convert(self, string)
+        return self.pad(result)
+
+    def inner_convert_string(self, string):
+        for (k,v) in TABLE.items():
+            string = string.replace(k, v)
+        return string
+
+
+    def pad(self, string):
+        """add some lorem ipsum text to the end of string"""
+        size = len(string)
+        if size < 7:
+            target = size*3
+        else:
+            target = int(size*PAD_FACTOR)
+        return string + self.terminate(LOREM[:(target-size)])
+
+    def terminate(self, string):
+        """replaces the final char of string with #"""
+        return string[:-1]+'#'
+
+    def init_msgs(self, msgs):
+        """
+        Make sure the first msg in msgs has a plural property.
+        msgs is list of instances of pofile.Msg
+        """
+        if len(msgs)==0:
+            return
+        headers = msgs[0].get_property('msgstr')
+        has_plural = len([header for header in headers if header.find('Plural-Forms:') == 0])>0
+        if not has_plural:
+            # Apply declaration for English pluralization rules
+            plural = "Plural-Forms: nplurals=2; plural=(n != 1);\\n"
+            headers.append(plural)
+        
+
+    def convert_msg(self, msg):
+        """
+        Takes one Msg object and converts it (adds a dummy translation to it)
+        msg is an instance of pofile.Msg
+        """
+        source = msg.msgid
+        if len(source)==0:
+            # don't translate empty string
+            return
+
+        plural = msg.msgid_plural
+        if len(plural)>0:
+            # translate singular and plural
+            foreign_single = self.convert(source)
+            foreign_plural = self.convert(plural)
+            plural = {'0': self.final_newline(source, foreign_single),
+                      '1': self.final_newline(plural, foreign_plural)}
+            msg.msgstr_plural = plural
+            return
+        else:
+            foreign = self.convert(source)
+            msg.msgstr = self.final_newline(source, foreign)
+
+    def final_newline(self, original, translated):
+        """ Returns a new translated string.
+            If last char of original is a newline, make sure translation
+            has a newline too.
+        """
+        if len(original)>1:
+            if original[-1]=='\n' and translated[-1]!='\n':
+                return translated + '\n'
+        return translated

i18n/make_dummy.py

+#!/usr/bin/python
+
+# Generate test translation files from human-readable po files.
+# 
+#
+# po files can be generated with this:
+# django-admin.py makemessages --all --extension html -l en
+
+# Usage:
+#
+# $ ./make_dummy.py <sourcefile>
+#
+# $ ./make_dummy.py mitx/conf/locale/en/LC_MESSAGES/django.po
+#
+# generates output to
+#    mitx/conf/locale/vr/LC_MESSAGES/django.po
+
+import os, sys
+import polib
+from dummy import Dummy
+
+# Dummy language 
+# two letter language codes reference:
+# see http://www.loc.gov/standards/iso639-2/php/code_list.php
+#
+# Django will not localize in languages that django itself has not been
+# localized for. So we are using a well-known language: 'fr'.
+
+OUT_LANG = 'fr'
+
+def main(file):
+    """
+    Takes a source po file, reads it, and writes out a new po file
+    containing a dummy translation.
+    """
+    if not os.path.exists(file):
+        raise IOError('File does not exist: %s' % file)
+    pofile = polib.pofile(file)
+    converter = Dummy()
+    converter.init_msgs(pofile.translated_entries())
+    for msg in pofile:
+        converter.convert_msg(msg)
+    new_file = new_filename(file, OUT_LANG)
+    create_dir_if_necessary(new_file)
+    pofile.save(new_file)
+    
+
+
+def new_filename(original_filename, new_lang):
+    """Returns a filename derived from original_filename, using new_lang as the locale"""
+    orig_dir = os.path.dirname(original_filename)
+    msgs_dir = os.path.basename(orig_dir)
+    orig_file = os.path.basename(original_filename)
+    return '%s/%s/%s/%s' % (os.path.abspath(orig_dir + '/../..'),
+                            new_lang,
+                            msgs_dir,
+                            orig_file)
+
+
+def create_dir_if_necessary(pathname):
+    dirname = os.path.dirname(pathname)
+    if not os.path.exists(dirname):
+        os.makedirs(dirname)
+
+if __name__ == '__main__':
+    if len(sys.argv)<2:
+        raise Exception("missing file argument")
+    main(sys.argv[1])

i18n/update.py

+#!/usr/bin/python
+
+import os, subprocess, logging, json
+from make_dummy import create_dir_if_necessary, main as dummy_main
+
+'''
+Generate or update all translation files
+ Usage:
+    $ update.py
+
+
+ 1. extracts files from mako templates
+ 2. extracts files from django templates and python source files
+ 3. extracts files from django javascript files
+ 4. generates dummy text translations
+ 5. compiles po files to mo files
+
+ Configuration (e.g. known languages) declared in mitx/conf/locale/config
+'''
+
+# -----------------------------------
+# BASE_DIR is the working directory to execute django-admin commands from.
+# Typically this should be the 'mitx' directory.
+BASE_DIR = os.path.abspath(os.path.dirname(os.path.abspath(__file__))+'/..')
+
+# LOCALE_DIR contains the locale files.
+# Typically this should be 'mitx/conf/locale'
+LOCALE_DIR = BASE_DIR + '/conf/locale'
+
+# MSGS_DIR contains the English po files
+MSGS_DIR = LOCALE_DIR + '/en/LC_MESSAGES'
+
+# CONFIG_FILENAME contains localization configuration in json format
+CONFIG_FILENAME = LOCALE_DIR + '/config'
+
+# BABEL_CONFIG contains declarations for Babel to extract strings from mako template files
+BABEL_CONFIG = LOCALE_DIR + '/babel.cfg'
+
+# Strings from mako template files are written to BABEL_OUT
+BABEL_OUT = MSGS_DIR + '/mako.po'
+
+# These are the shell commands invoked by main()
+COMMANDS = {
+    'babel_mako': 'pybabel extract -F %s -c "TRANSLATORS:" . -o %s' % (BABEL_CONFIG, BABEL_OUT),
+    'make_django': 'django-admin.py makemessages --all --ignore=src/* --extension html -l en',
+    'make_djangojs': 'django-admin.py makemessages --all -d djangojs --ignore=src/* --extension js -l en',
+    'msgcat' : 'msgcat -o merged.po django.po %s' % BABEL_OUT,
+    'rename_django' : 'mv django.po django_old.po',
+    'rename_merged' : 'mv merged.po django.po',
+    'compile': 'django-admin.py compilemessages'
+    
+    }
+
+def execute (command_kwd, log, working_directory=BASE_DIR):
+    '''
+    Executes command_kwd, which references a shell command in COMMANDS.
+    '''
+    full_cmd = COMMANDS[command_kwd]
+    log.info('%s' % full_cmd)
+    subprocess.call(full_cmd.split(' '), cwd=working_directory)
+    
+def make_log ():
+    '''returns a logger'''
+    log = logging.getLogger(__name__)
+    log.setLevel(logging.INFO)
+    log_handler = logging.StreamHandler()
+    log_handler.setFormatter(logging.Formatter('%(asctime)s [%(levelname)s] %(message)s'))
+    log.addHandler(log_handler)
+    return log
+
+def get_config ():
+    '''Returns data found in config file, or returns None if file not found'''
+    config_path = os.path.abspath(CONFIG_FILENAME)
+    if not os.path.exists(config_path):
+        return None
+    with open(config_path) as stream:
+        return json.load(stream)
+
+def main ():
+    log = make_log()
+    create_dir_if_necessary(LOCALE_DIR)
+    log.info('Executing all commands from %s' % BASE_DIR)
+
+    remove_files = ['django.po', 'djangojs.po', 'nonesuch']
+    for filename in remove_files:
+        path = MSGS_DIR + '/' + filename
+        log.info('Deleting file %s' % path)
+        if not os.path.exists(path):
+            log.warn("File does not exist: %s" % path)
+        else:
+            os.remove(path)
+
+    # Generate or update human-readable .po files from all source code.
+    execute('babel_mako', log=log)
+    execute('make_django', log=log)
+    execute('make_djangojs', log=log)
+    execute('msgcat', log=log, working_directory=MSGS_DIR)
+    execute('rename_django', log=log, working_directory=MSGS_DIR)
+    execute('rename_merged', log=log, working_directory=MSGS_DIR)
+
+    # Generate dummy text files from the English .po files
+    log.info('Generating dummy text.')
+    dummy_main(LOCALE_DIR + '/en/LC_MESSAGES/django.po')
+    dummy_main(LOCALE_DIR + '/en/LC_MESSAGES/djangojs.po')
+
+    # Generate machine-readable .mo files
+    execute('compile', log)
+
+if __name__ == '__main__':
+    main()

lms/templates/discussion/_single_thread.html

@@ -6,7 +6,7 @@
   <div class="discussion-post">
   
     <header>
-    %if thread['group_id']
+    %if thread['group_id']:
       <div class="group-visibility-label">This post visible only to group ${cohort_dictionary[thread['group_id']]}. </div>
     %endif
       
@@ -35,4 +35,4 @@
   </ol>
 </article>
 
-<%include file="_js_data.html" />
+<%include file="_js_data.html" />
\ No newline at end of file

requirements.txt

 -r repo-requirements.txt
+Babel==0.9.6
 beautifulsoup4==4.1.3
 beautifulsoup==3.2.1
 boto==2.6.0