Focused on enhancing localization for Mattermost’s desktop and mobile platforms, this developer delivered two features centered on Chinese (Simplified Han) language support. Work in the mattermost/desktop repository increased translation completeness from approximately 98.4% to 99% through multiple Weblate-driven updates, while the mattermost/mattermost-mobile repository achieved full localization coverage with 1212 translated strings. The approach emphasized internationalization readiness, leveraging JSON and XML formats to ensure consistency and quality across platforms. By integrating Weblate workflows and collaborating across teams, the developer improved localization QA and prepared both applications for release, supporting a more accessible experience for Chinese-speaking users.