Question: Is there a plugin that allows me to fine-tune translations manually after automated translation, and also supports SEO optimization?

If you want a plugin that lets you fine-tune translations manually after the automated translation, and that also offers SEO optimization, TranslatePress is a good option. It connects to machine translation services like DeepL, Google Translate and Microsoft Translator for advanced automated translations. It also offers manual translation controls so you can fine-tune content to your needs. It's SEO-aware, preserving page slugs, titles, descriptions and social graph data so you can keep your website's search engine ranking.

Another option worth considering is Linguana, which focuses on translation for Framer and Webflow sites. It offers AI and manual translation options, and translated URL slugs for good SEO. The subdirectory structure is clean and easy to understand, and Linguana supports custom domains and subfolders for better SEO. It's a good option if you're using Framer or Webflow sites and need strong translation and SEO abilities.

For a more general-purpose option, check out GTranslate. It supports more than 100 languages and offers machine translation with manual editing abilities. It indexes translated pages for search engines and offers several pricing tiers, including a free option. GTranslate supports multiple URL structures, so it's a good option if you need flexibility for good SEO.

Last, ConveyThis offers AI-powered real-time translation and SEO localization, which can be useful for e-commerce sites trying to expand to new markets. It integrates with common e-commerce sites like WordPress, Shopify and BigCommerce, and offers customizable language switchers and subdomain URL structures for good SEO.