hi friends i want create a website like youtube and i use just html java and css and
Is it possible to add another language and will this language develop the project further?
Hugely depends on what frameworks / libraries you use for said languages. Also, I think you confused Java with JavaScript (you have the node tag in the post, and Node is JavaScript) as Java != JS. 
But it’s definitely possible to add another language to your tech stack and it for sure may expand your project.
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ok thanks you for your help
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Just a note, you cannot add more languages to a HTML/CSS/JS Repl, those are intended for static files only. (Any other Repl/template should work fine)
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True, if we’re talking about Repls in particular here.