Guenael Muller enhanced cross-distribution locale support in the zephyrproject-rtos/poky repository by unifying the en_US.UTF-8 locale installation process for both Ubuntu and Debian systems. He updated poky.yaml.in and improved system requirements documentation, focusing on standardizing locale enablement and providing clear, non-interactive setup instructions. Using RST for documentation and YAML for configuration, Guenael addressed previous inconsistencies that limited locale support to Ubuntu, thereby reducing deployment friction for downstream users and CI environments. The work demonstrated a focused approach to system configuration and documentation, delivering a targeted feature with clear technical depth over the course of the month.