There's a package, translateR that has bindings to the Google and Microsoft translation APIs. I don't know whether those will solve what you're looking for, but it's a place to start.
There are a number of ways to search for R packages, one os which is using the RDocumentation site. Below, for example, are searches for "translate" and "hindi", respectively. Matching packages will be shown on the left, and matching functions are shown on the right.
https://www.rdocumentation.org/search?q=translate
https://www.rdocumentation.org/search?q=hindi&latest=1
Since this isn't related to the RStudio IDE, I'm going to move this to the #general category.