Include 404 bn

[JorgeMadson]

Description

Small fix for the template for new languages 404

Fixes # (No issue)

Required checklist:

• [X] My code matches the existing code style of this project.
• One of these:
  • [ ] This is a new localization for existing content.
  • [X] This is new content that is localized for all the locales that this project currently supports.
  • [ ] I described above how I plan to localize this content immediately after merging these changes.
  • [ ] Localization is not applicable to this change.
• [X] I have tested my code and it successfully builds for GitHub Pages and validates as AMP.