Translation setup for sahara-dashboard

In Liberty, sahara-dashboard supports translations, but does not now.
Once this patch is merged, we can enable the infra tranlation jobs.

* Prepare babel-{django|djangojs}.cfg so that the infra script
  extracts message catalogs [1]
* Update devstack plugin to compile message catalogs
* Remove babel related entries in setup.cfg because it does not
  work for horizon plugins. Babel does not support message extraction
  for multiple domains.
* Create symlink sahara_dashboard/content/data_processing/locale
  (which points to sahara_dashboard/locale)
  The infra translation script assumes <modulename>/locale as
  locale dir. On the other hand, sahara dashboard registers
  "sahara_dashboard.content.data_processing" in INSTALLED_APPS.
  Django search locale data from <apps>/locale for each INSTALLED_APPS.
  Thus this symlink is required to make translation work.

Note that I am not sure why sahara dashboard uses
"sahara_dashboard.content.data_processing" as INSTALLED_APPS unlike
other horizon related projects, but it needs more investigation
and this patch does not touch it at the moment.

[1] http://docs.openstack.org/infra/manual/creators.html#enabling-translation-infrastructure

Change-Id: I93609a1af08b5a6f64fc43c16722f4c759f68302

babel-django.cfg

@@ -0,0 +1,5 @@
+[extractors]
+django = django_babel.extract:extract_django
+
+[python: **.py]
+[django: **/templates/**.html]

babel-djangojs.cfg

@@ -0,0 +1,14 @@
+[extractors]
+# We use a custom extractor to find translatable strings in AngularJS
+# templates. The extractor is included in horizon.utils for now.
+# See http://babel.pocoo.org/docs/messages/#referencing-extraction-methods for
+# details on how this works.
+angular = horizon.utils.babel_extract_angular:extract_angular
+
+[javascript: **.js]
+
+# We need to look into all static folders for HTML files.
+# The **/static ensures that we also search within
+# /openstack_dashboard/dashboards/XYZ/static which will ensure
+# that plugins are also translated.
+[angular: **/static/**.html]

devstack/plugin.sh

@@ -8,6 +8,16 @@ function install_sahara_dashboard {
 
 function configure_sahara_dashboard {
     cp -a ${SAHARA_DASH_DIR}/sahara_dashboard/enabled/* ${DEST}/horizon/openstack_dashboard/local/enabled/
+    # compile message catalogs
+    # NOTE: "python manage.py compilemessages does not work"
+    # so we compile translation catalogs directly.
+    if [ -d sahara_dashboard/locale ]; then
+        for domain in django djangojs; do
+            if find sahara_dashboard/locale -type f | grep -q "${domain}.po$"; then
+                pybabel compile -D ${domain} -d sahara_dashboard/locale
+            fi
+        done
+    fi
 }
 
 # check for service enabled

sahara_dashboard/content/data_processing/locale

@@ -0,0 +1 @@
+../../locale

setup.cfg

@@ -30,17 +30,3 @@ all_files = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html
-
-[compile_catalog]
-directory = sahara_dashboard/locale
-domain = sahara-dashboard
-
-[update_catalog]
-domain = sahara-dashboard
-output_dir = sahara_dashboard/locale
-input_file = sahara_dashboard/locale/sahara_dashboard.pot
-
-[extract_messages]
-keywords = _ gettext ngettext l_ lazy_gettext
-mapping_file = babel.cfg
-output_file = sahara_dashboard/locale/sahara_dashboard.pot