add translate hook to plugins

[Marcel-Tronco]

Updating my mirador setup to the recent 4.0 alpha I ran into problems using the mirador-image-plugin, because it didn't get the translation function it expected as a prop t. This commit solved it for me locally.

Feel free to use this.

Best

[cbeer]

Thanks for looking into this. @marlo-longley and I were talking about this problem over on #4095, and this seems like the option 2 I offered over there. We shipped #4098 (option 1) as an alternative to this that hopefully works better with hooks or more complicated plugins (otherwise you'd have to pass the plugin-provided t to any subcomponents, we think?).

This will take a little update in any plugins (e.g. ProjectMirador/mirador-dl-plugin#82) but Mirador 4 already requires some updates so we'll just include them in the release notes soon.

Thanks again