Contributed accessibility improvements to the incubateur-ademe/nosgestesclimat-site-nextjs repository by refining ARIA labels and language attributes on primary user interface controls. This work enhanced screen reader compatibility and improved language identification, supporting a more inclusive experience for users relying on assistive technologies. The approach involved applying semantic HTML practices and accessibility testing within a React and Next.js environment, with changes focused on buttons and primary controls. Collaboration with another contributor helped ensure code quality and knowledge sharing. The updates addressed a specific accessibility issue, aligning the project with regulatory requirements and broadening its usability for a diverse user base.