Provide multi lingual versions
Provide the ProtonMail Service in further major European languages such as German, French, Spanish, Italian. That could improve the acceptance and increase the number of users.

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Miguel commented
Please, activate a transifex or pootle service. With that ProtonMail could be localized into any languages. I'd like to help translating it into Galician language.
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aa commented
also needs Urdu
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Poliedro commented
Please Spanish translation.
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Verton commented
I vote for Czech language. Please consider one of a web-based translation platforms. https://www.transifex.com/ could be a good choice.
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Cr4ck3r commented
German would be great.
I would love to help with the transaltion. -
Anonymous commented
Polish
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Anonymous commented
How about Arabic? As advisor to the Arab Gulf and North Africa, you could capture major market share if I advise the top decision makers, as it is very "top down" in these cultures---everyone will sign on if a top leader gives it his blessing. Cheers!