Enable BAAI/AltCLIP model to better handle Chinese prompts 
### Feature request

We already have our bilingual CLIP model here: https://huggingface.co/BAAI/AltCLIP    (currently private)
Would you like to collaborate with us to merge it into transformers?
Thanks a lot!

### Motivation

Want to enable our bilingual ALtCLIP model to handle Chinese prompts as well as English; 

### Your contribution

We can collaborate with you to work on it. We are familiar with our model, but is not clear how to merge in into transformers
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