A useful feature for the new Energy Dashboard would be to add multilingual support.
In other dashboards this is possible, since you can just edit the friendly name of the entity shown in the card config.
For me, the most important place for this feature woul be for individual devices. I imagine something like showing different Names of devices on a per user base, for example: have a configuration file for each user in which you can override names of entities.
In other words, have a customize.yaml file in general and one for each user, that overrides the general customize.yaml file