We hope you are using WPML's Advanced Translation Editor to translate your posts and pages. If so, you will be able to translate the SEO meta titles and descriptions automatically. The Advanced Translation Editor has translation memory. If multiple posts or pages use similar SEO content, the system will automatically apply the translation without using additional credits.
However, for global SEO settings (like homepage meta title and description), you will need to translate them manually from WPML >> String Translation, as explained in this guide:
