Add multilanguage dreambooth support based on AltDiffusion

[marscrazy]

Based on AltDiffusion, we can train a dreambooth model with different languages.

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[patrickvonplaten]

That's super cool! I wonder though if we could just support it out of the box in the original dreambooth training script: https://github.com/huggingface/diffusers/blob/main/examples/dreambooth/train_dreambooth.py - maybe just with a couple of if-else statements.

@patil-suraj what do you think?

[patrickvonplaten]

Hey @marscrazy,

Would it be ok to just merge https://github.com/huggingface/diffusers/pull/1470 instead. This way we can be sure the training script for altdiffusion stays in sync :-)

[patil-suraj]

Hey @marscrazy , merged #1470 , as it allows to use the same script with both pipelines.