[1.7.x] Re-added JS catalog in manage_translations script

Backport of d20aa78c from master.

scripts/manage_translations.py

@@ -72,10 +72,10 @@ def _check_diff(cat_name, base_path):
     """
     po_path = '%(path)s/en/LC_MESSAGES/django%(ext)s.po' % {
         'path': base_path, 'ext': 'js' if cat_name.endswith('-js') else ''}
-    p = Popen("git diff -U0 %s | egrep -v '^@@|^[-+]#|^..POT-Creation' | wc -l" % po_path,
+    p = Popen("git diff -U0 %s | egrep '^[-+]msgid' | wc -l" % po_path,
               stdout=PIPE, stderr=PIPE, shell=True)
     output, errors = p.communicate()
-    num_changes = int(output.strip()) - 4
+    num_changes = int(output.strip())
     print("%d changed/added messages in '%s' catalog." % (num_changes, cat_name))
 
 
@@ -91,9 +91,11 @@ def update_catalogs(resources=None, languages=None):
     os.chdir(os.path.join(os.getcwd(), 'django'))
     print("Updating en catalogs for Django and contrib apps...")
     call_command('makemessages', locale=['en'])
-    _check_diff('core', os.path.join(os.getcwd(), 'conf', 'locale'))
+    print("Updating en JS catalogs for Django and contrib apps...")
+    call_command('makemessages', locale=['en'], domain='djangojs')
 
-    # Stats for contrib catalogs
+    # Output changed stats
+    _check_diff('core', os.path.join(os.getcwd(), 'conf', 'locale'))
     for name, dir_ in contrib_dirs:
         _check_diff(name, dir_)