Offline AI Language Translator

I'm looking for an AI tool that can translate English into Chinese and vice versa. This tool will be used by soldiers at the International Border, so it needs to support offline functionality.

Key Features:
- **Language Support**: The tool should translate between English and Chinese.
- **Platform Compatibility**: The AI tool should be compatible with Android, iOS, and Windows.
- **Input Methods**: The tool should support both voice and text input.

Ideal Skills and Experience:
- Proficiency in AI and machine learning.
- Extensive knowledge in developing cross-platform applications.
- Experience with creating offline functionality in applications.
- Understanding of military communication needs is a plus.