Worked on enhancing the Spanish localization of the greenhouse-effect simulation in the phetsims/greenhouse-effect repository, focusing on improving clarity and naturalness for Spanish-speaking users. Applied internationalization and localization skills to update the greenhouse-effect-strings_es.ftl translation file, making targeted grammatical corrections and refining phrasing to reduce ambiguity in the user interface. The technical approach centered on careful review and adjustment of Fluent Translation Language (FTL) resources to ensure accurate and accessible translations. No major bugs were addressed during this period, as the primary contribution was delivering a more user-friendly and localization-ready experience for Spanish users through improved translation quality.