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Excellent suggestions. You may wish to add to a new or existing thread in HubSpot Ideas.
You’ll typically get much more traction from the HubSpot Community AND the Ideas Forum is where HubSpot Product Teams monitor suggestions for popularity -- i.e., VOTES! 
That being said, multi-language content delivery and corresponding backend functionality is a HUGE challenge across many platforms. HubSpot is no exception.
Easily use smart rules to auto-display language-specific cotnent based on referring country.
see 2-Language Example LP (based on referring country)

The real challenge begins when we attempt to process data captured in multiple languages. It’s a nice idea to expect HubSpot (or any SaaS platform) to allow smart rules within forms, but what would that even look like when adding to the CRM?
- Would we expect HubSpot to smart-swap custom properties based on language?
-- And if so, wouldn’t that mean we’d have to pre-build those custom multi-language properties ahead of time anyway (just like we do now)?
- Would it also mean multiple, language-specific HubSpot properties -- e.g., Lead Status, Lifecycle Stage, etc.? (a serious headache)
-- And if so, what would that look like on the backend? (multiple languages?)
Point?
Seems like a HUGE amount of work to satisfy what we’re guessing is a relatively tiny segment of HubSpot Users who have extensive multi-language needs which can’t be met by existing HubSpot smart rule functionality and language-specific customizations.
2 languages = 2 forms = 2 sets of language-specific custom properties.
N-languages = n-forms = n-sets of language-specific custom properties.
Happy to help you build …
Best,
Frank
www.MFrankJohnson.com