Those are just warnings that the tidyverse contains functions named filter() and lag() which are also present in other packages. As a result, the functions in stats have been masked (superseded) by the ones in tidyverse. Generally, you won't have problems as a result of those conflicts.
Hey thanks your your answer so does this mean that the download of this package was successful ? And do you know if there is a way to use German as my language in r studio ?
Yes, it was successful. Sorry, I've never tried using RStudio in a language other than English. Maybe another community member will be able to guide you.