Hmm, I don't know enough to give you a confident answer yet. The extracts provided do not contain specific information about the astro-i18n library or issues related to hydrating React components with client:load in Astro.
However, it's worth noting that Astro does support hydrating components for interactivity. If you're trying to hydrate an Astro component with a client: modifier, you might encounter an error because Astro components are HTML-only templating components with no client-side runtime. Instead, you can use a <script> tag in your Astro component template to send JavaScript to the browser that executes in the global scope (source (https://docs.astro.build/en/core-concepts/framework-components#can-i-hydrate-astro-components)).
If you're facing issues with React components not loading or functioning correctly, it might be related to a known bug where Astro fails to load lazy SolidJS components after server startup due to a race condition (source (https://github.com/withastro/astro/issues/6912)). However, this issue is specific to SolidJS components and might not apply to your React components.
For more detailed help, I recommend checking out the Astro documentation (https://docs.astro.build/) or the Astro GitHub issues (https://github.com/withastro/astro/issues) to see if others have encountered similar problems.
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: