old_contents: import re
  import json
  import glob
  
  locale_folder = "../locales/"
  locale_files = glob.glob(locale_folder + "*.json")
  locale_files = [filename.split("/")[-1] for filename in locale_files]
  locale_files.remove("en.json")
  
  reference = json.loads(open(locale_folder + "en.json").read())
  
  for locale_file in locale_files:
  
      this_locale = json.loads(open(locale_folder + locale_file).read())
  
      for key, string in reference.items():
          if key in this_locale:
  
              subkeys_in_ref = set(k[0] for k in re.findall(r"{(\w+)(:\w)?}", string))
              subkeys_in_this_locale = set(k[0] for k in re.findall(r"{(\w+)(:\w)?}", this_locale[key]))
  
              if any(key not in subkeys_in_ref for key in subkeys_in_this_locale):
                  print("\n")
                  print("==========================")
                  print("Format inconsistency for string %s in %s:" % (key, locale_file))
                  print("%s   -> %s " % ("en.json", string))
                  print("%s   -> %s " % (locale_file, this_locale[key]))
  
  
new_contents: import re
  import json
  import glob
  
  # List all locale files (except en.json being the ref)
  locale_folder = "../locales/"
  locale_files = glob.glob(locale_folder + "*.json")
  locale_files = [filename.split("/")[-1] for filename in locale_files]
  locale_files.remove("en.json")
  
  reference = json.loads(open(locale_folder + "en.json").read())
  
  found_inconsistencies = False
  
  # Let's iterate over each locale file
  for locale_file in locale_files:
  
      this_locale = json.loads(open(locale_folder + locale_file).read())
  
      # We iterate over all keys/string in en.json
      for key, string in reference.items():
          # If there is a translation available for this key/string
          if key in this_locale:
  
              # Then we check that every "{stuff}" (for python's .format())
              # should also be in the translated string, otherwise the .format
              # will trigger an exception!
              subkeys_in_ref = set(k[0] for k in re.findall(r"{(\w+)(:\w)?}", string))
              subkeys_in_this_locale = set(k[0] for k in re.findall(r"{(\w+)(:\w)?}", this_locale[key]))
  
              if any(key not in subkeys_in_ref for key in subkeys_in_this_locale):
                  found_inconsistencies = True
                  print("\n")
                  print("==========================")
                  print("Format inconsistency for string %s in %s:" % (key, locale_file))
                  print("%s   -> %s " % ("en.json", string))
                  print("%s   -> %s " % (locale_file, this_locale[key]))
  
  if found_inconsistencies:
      sys.exit(1)
  
subject: Add comments + return 1 if inconsistencies found