Spanish translation missing for some error messages in Django 5.2.7

[Carlos Sánchez López]

Expected behavior

Email validation error should display in Spanish: "Introduzca una dirección de correo electrónico válida."

Actual behavior

Error displays in English: "Enter a valid email address."

Note: All other Django admin messages (form errors, labels, etc.) correctly display in Spanish.
Only this specific email validation message appears in English.

Configuration

• Django Version: 5.2.7
• Python Version: 3.13
• settings.py:

  ...
  MIDDLEWARE = [
     ...
      'django.contrib.sessions.middleware.SessionMiddleware',
      'django.middleware.locale.LocaleMiddleware',
      'django.middleware.common.CommonMiddleware',
      ...
  ]
  ...
  LANGUAGE_CODE = 'es'
  USE_I18N = True
  LANGUAGES = [('es', 'Spanish')]
  ...
  

Investigation

Confirmed the English string is still used in Django's validator:

$ grep -i "email" env/lib/python3.13/site-packages/django/core/validators.py | grep -i "message"
    message = _("Enter a valid email address.")

Checked Spanish locale file - translation exists but is marked as obsolete (#~):

$ grep -i "correo" env/lib/python3.13/site-packages/django/conf/locale/es/LC_MESSAGES/django.po
#~ msgstr "Introduzca una dirección de correo electrónico válida."
#~ msgstr "Correo electrónico"
#~ msgstr "Introduzca una dirección de correo electrónico válida."
#~ msgstr "Correo electrónico"

Confirmed no active (non-obsolete) translation exists:

$ grep -i "valid.*email" env/lib/python3.13/site-packages/django/conf/locale/es/LC_MESSAGES/django.po | grep -v "^#"
# no results returned

Verified the compiled .mo file doesn't contain the translation:

$ msgunfmt env/lib/python3.13/site-packages/django/conf/locale/es/LC_MESSAGES/django.mo | grep -i "email"
# no results returned

[Carlos Sánchez López]

Screenshot of the email validation error at the bottom. Notice everything else from the admin site is correctly showing up in Spanish.