This repository is a Spanish localization data package for the mobile game Umamusume: Pretty Derby, designed to be used with the Hachimi modding tool. It contains over 11,000 JSON files under `localized_data/` that provide translated dialogue for story scenes, home screen interactions, race commentary, and song lyrics. The data follows a consistent schema (`no_wrap`, `text_block_list` with `name`, `text`, optional `choice_data_list` and `color_text_info_list`), making it easy to parse and integrate. The only executable code is `gen_index.py`, a utility that walks the git tree and generates a JSON index with Blake3 hashes for file integrity verification, used by Hachimi to fetch updates. The repository also includes configuration files (`config.json`, `config_android.json`) for the modding tool and a GitHub Actions workflow (`release.yml`) that automatically builds and deploys the index on pushes to main. While not a traditional data research project, the repo represents a well-organized, version-controlled dataset for game localization, with a clear pipeline for distribution. The translation quality appears consistent, though the large number of files and presence of some duplicate entries suggest manual maintenance overhead. The `gen_index.py` script is a self-contained, reusable component for generating file indexes with cryptographic hashes, applicable to any mod or asset pack project.