Leveraging Multilingual Content Blocks is the best option for NTO to create and send localized content at scale. Multilingual Content Blocks allow you to create a single content block that can display different versions of text based on the subscriber's preferred language. You can use a spreadsheet or a data extension to store the translations and then map them to the content block. This way, you can avoid creating multiple templates or emails for each language. Leveraging templates with AMPscript or Enhanced Dynamic Content would require more coding and development skills.