Based on the provided hint and after analyzing the content of the `README.md`, here are the issues identified:

---

{
    "issue": "Missing 'language: en' metadata in the YAML block of README",
    "evidence": "```\nlicense: cc-by-3.0\ndataset_info:\n  features:\n  - name: category...\n```",
    "description": "The YAML block at the beginning of the `README.md` file is missing the 'language: en' metadata entry, which should explicitly denote the language of the dataset documentation and data to be English. This entry is crucial for ensuring the dataset can be correctly indexed and utilized by users and systems looking for English language resources."
}

---

The evidence provided is a snippet of the YAML block from the beginning of the `README.md` file, which showcases the structure and content but notably does not include a 'language: en' entry. This omission could lead to ambiguity regarding the language of the dataset documentation and potentially its content, making it harder for users to find and utilize the dataset appropriately according to their language preferences or requirements.