language packs should be available at no cost with every license
I was surprised when noticed that Plesk does not provide language packs out-of-the-box and asks for additional money for it. Really?
Localization is a part of the basic functionality or it should be so. Web host edition license with 1 language available is a nonsense!
Make language packs available at no cost with every license.

Hello and thanks for reaching out to us,
Localization is basic functionality indeed, so Plesk Administrator can pick any of provided 32 languages as their server language at no additional cost. People in each of those regions are equal in their ability to access Plesk. So seems like your request is already available.
Plesk does charge however for the availability of multiple languages when some users would use one language and others would use different language or languages. That would be a different case as it allows Plesk Administrator to get an additional audience from different countries and/or cultures and earn additional revenue. This option comes at a reasonable cost which helps us cover expenses for professional translations which are kind of expensive. Unlike some other solutions, Plesk doesn’t use poor quality machine translations or community translations. We hope that proper translation would make sufficient comfort for end-customers to justify additional surcharge covering translation effort.
Thanks again
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Curtis Maurand commented
We need it because some of our developers are in other countries and we need to offer the control panel in their native language. $6.50/month for something that should be included is pretty expensive. I could see $1.00 or $2.00, but what you have is outrageous.