./run_tests.sh --makemessages update English PO files only

Closes-Bug: #1224388

We don't need to update PO files of all languages.
PO files of languages other than English should be update by
importing translations from Transifex.

This commit changes "run_tests.sh --makemessages" only updates
English PO files. This makes a patch updating PO files shorter
and helps reviewers to check it.

Change-Id: I5410a06b0bcb0f42c5a0853f95a3fe2087519d51

run_tests.sh

@@ -330,13 +330,16 @@ function run_tests_all {
 }
 
 function run_makemessages {
+  echo -n "horizon: "
   cd horizon
-  ${command_wrapper} $root/manage.py makemessages --all --no-obsolete
+  ${command_wrapper} $root/manage.py makemessages -l en --no-obsolete
   HORIZON_PY_RESULT=$?
-  ${command_wrapper} $root/manage.py makemessages -d djangojs --all --no-obsolete
+  echo -n "horizon javascript: "
+  ${command_wrapper} $root/manage.py makemessages -d djangojs -l en --no-obsolete
   HORIZON_JS_RESULT=$?
+  echo -n "openstack_dashboard: "
   cd ../openstack_dashboard
-  ${command_wrapper} $root/manage.py makemessages --all --ignore=openstack/common/* --no-obsolete
+  ${command_wrapper} $root/manage.py makemessages -l en --ignore=openstack/common/* --no-obsolete
   DASHBOARD_RESULT=$?
   cd ..
   exit $(($HORIZON_PY_RESULT || $HORIZON_JS_RESULT || $DASHBOARD_RESULT))