[ENHANCEMENT] multilingual_clip from local cache

[rcking]

Feature Request
It would be useful to be able to use multilingual_clip models in a offline environment.

It is already possible to load clip/open_clip models from a local cache by setting the "localpath" property in the model settings.

However, this is presently not possible for multilingual_clip.

Proposed Solution
I would like to see an update of clip_utils.py that loads a multilingual_clip model from a local cache.

This might require two separate parameters (e.g., "localpath_visual" and "localpath_textual") to be parsed from the model configuration.