Shiny.i18n not translate the modal dialoge rendered within module - r

Question

I want to translate parts of my UI in a modularized shiny app. As I summarized my simplified code,
in the first module I have no problem with i18n as it is enters to the module 1 with argument i18n and
translation works well in registerUI(based on recommendation here). But my problem is with the UI of module 2 (M2UI) which this function
itself called within the server of module 1 (register) to return a modal dialogue. But i18n not detected and translation not works on displayed new modal. Any suggestions why this happens? thanks in advance...
I edited my example and it is now completely reproducible. Translation csv files are available here. Just copy them in "translations" forlder. And, the modules should be copied to "modules" folder.
## CSV translation files are available at : https://github.com/Appsilon/shiny.i18n/tree/master/examples/data
# Copy "translation_it.csv" and "translation_pl.csv" files to "translations" folder
###### make modules and copy them into folder "modules"
source("modules/register.R")
source("modules/M2.R")
#####
library(shiny)
library(shiny.i18n)
library(shinydashboard)
i18n <- Translator$new(translation_csvs_path = "translations")
i18n$set_translation_language("en")
shiny.i18n::usei18n(i18n)
############################ UI
header <- dashboardHeader(title = i18n$t('Hello Shiny!'), titleWidth = 400 ,
tags$li( fluidRow(
shiny.i18n::usei18n(i18n),
div(style="display: inline-block;vertical-align:top; font-size: 10px; height=30px;width: 150px;",selectInput(
inputId='selected_language',
label=i18n$t('Change language'),
choices = i18n$get_languages(),
selected = i18n$get_key_translation()
))
),
class = "dropdown")
)
# Sidebar Menu ------------------------------------------------------------
sidebar <- dashboardSidebar(width = 220,
sidebarMenu(
menuItem( i18n$t("Hello Shiny!"), tabName = "diary", icon = icon("align-justify")),
menuItem("Help", tabName = "help", icon = icon("table")),
#menuItem("Data analysis", tabName = "descriptive", icon = icon("chart-bar")),
menuItem("About", tabName = "about", icon = icon("info-circle"))
)
)
body <- dashboardBody(
tabItems(
tabItem("diary",
# includeMarkdown("Introduction.Rmd"),
# includeMarkdown("Contact.Rmd")
titlePanel(i18n$t("Hello Shiny!")),
sidebarLayout(
sidebarPanel(
sliderInput("bins",
i18n$t("Number of bins:"),
min = 1,
max = 50,
value = 30)
),
mainPanel(
plotOutput("distPlot"),
actionButton("test","test"),
p(i18n$t("This is description of the plot."))
)
),
tags$style(type = "text/css", ".recalculating {opacity: 1.0;}"), # Prevents gray screen during Sys.sleep()
),
tabItem("help",
),
tabItem("about",
)
)
)
ui <- dashboardPage(title = 'Coronavirus', header, sidebar, body, skin='blue')
#################################### SERVER
server <- function(input, output,session) {
observeEvent(input$selected_language, {
update_lang(session, input$selected_language)
})
shiny::observeEvent(input$test, {
registerUI(id = "REG",reg_title=i18n$t("Hello Shiny!"),i18n=i18n ) #This ID should be mached with ID in server
})
callModule(register,id = "REG", title= i18n$t("Hello Shiny!"), i18n=i18n )
output$distPlot <- renderPlot({
x <- faithful[, 2]
bins <- seq(min(x), max(x), length.out = input$bins + 1)
hist(x, breaks = bins,
col = "darkgray", border = "white",
main = i18n$t("Histogram of x"), ylab = i18n$t("Frequency"))
})
}
shinyApp(ui = ui, server = server)
registerUI <- function(id, reg_title=NULL ,i18n) {
ns <- shiny::NS(id)
shiny.i18n::usei18n(i18n)
showModal(tags$div( modalDialog(title = "" ,size="s",
shiny::div(id =ns("regpanel"),
shiny::wellPanel(
shiny::tags$h2(reg_title, class = "text-center", style = "padding-top: 0;"),
shinyjs::disabled(shiny::textInput(ns("user_name1"), value= "", shiny::tagList(shiny::icon("user"), "suggested user name"))) ,#
shiny::actionButton(ns("regSubmit"), i18n$t("Submit") , class = "btn-primary", style = "color: white;")
)
)
),
easyClose = TRUE, footer = NULL ))
}
###### Module 1
register <- function(input, output, session ,title,i18n) {
ns <- session$ns
shiny::observeEvent(input$regSubmit, {
shiny.i18n::usei18n(i18n)
removeModal()
M2UI(id = ns("M2") ,reg_title=i18n$t("Hello Shiny!" ),i18n=i18n )
})
callModule(M2,id = "M2" , title= i18n$t("Hello Shiny!"),i18n=i18n)
}
###### Module 2
M2UI <- function(id, reg_title=NULL,i18n ) {
ns <- shiny::NS(id)
shiny.i18n::usei18n(i18n)
showModal(modalDialog(title = reg_title ,size="s",
shiny::wellPanel(
shiny::actionButton(ns("Finish"), i18n$t("Hello Shiny!" ) )
)
, easyClose = TRUE, footer = NULL ) )
}
M2 <- function(input, output, session ,title,i18n) {
ns <- session$ns
shiny::observeEvent(input$Finish, {
removeModal()
})
}

Answer 1

Did you try the latest dev version? You have to update it through the dev package. I am pretty sure it was fixed there. The problem regarded a missing callback through shiny session.
Your exampe works on my setup.