Yes @andresrcs , deploy to shinyapps.io.
I did this in the app, as suggested:
Sys.setlocale("LC_ALL", "pt_BR.UTF-8")
library(shiny)
library(shinythemes)
library(dplyr)
...
However, in the generated site, it still remains the weekdays in the English language . However, if I test the application through RStudio, the weekdays appear in Portuguese. This is weird! Any tips on what I can do to adjust?