Hooking block add/edit form to add option to all blocks

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Hi,

I'm fairly new to developing in concrete5 (working on first site with it at the moment) and have been searching for a method to hook into the add/edit block form creation in order to add a custom option (language selection) to all blocks. The idea is to assign a language (either "All", "English" or "Chinese" in this case) to any block in order to allow for multiple languages to be displayed without duplicating entire pages.

The event hooks documentation does not provide any information on hooking into this, and I have not had any luck googling for a method to accomplish this.

Does anyone know a method which might help me out here? If not, would there be much demand in such a feature being added?

Alternatively, what are some other methods that could be used to allow translations to specific parts of a page?

Thanks for any input anyone has on the topic :)