There’s a extension called “Widget Logic”. It adds a field to every sidebar widget in admin section where you can add a piece of php code that you can use to archive what you most likely need.
Its a bit cumbersome but works. For example you mention that for multilanguage site, you can still use “is_page” since you can also pass array for the function, like this: is_page(array(94,71,3)) .. With logic operators (and/or/not/xor) combined with you can archive any combination.
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