opt_interactive() with locale "de_CH" and "fr_CH" not working

[lgnbhl]

Prework

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Description

When changing to locale "de_CH" or "fr_CH", the number formating change correctly (the separation mark becomes " ' " for "de_CH", see the mpg column in the example) but the language in the buttons of the interactive table created by opt_interactive() remains in English, while it should be in German for "de_CH" or in French for "fr_CH".

Reproducible example

When using gt(locale = "de_CH") with opt_interactive(), the labels remains in English instead of being in German.

library(gt)
library(dplyr)

mtcars |> 
  mutate(mpg = mpg*1000) |> 
  gt(locale = "de_CH") |> # or "fr_CH"
  fmt_number(mpg, decimals = 2) |>
  opt_interactive()

Expected result

When using "de_CH", the buttons of the interactive table should be "1–10 von 32 Zeilen" on the left, "Zurück" and "Weiter" on the left.

[lgnbhl]

I tried the following workaround but the sep_mark argument doesn't work when using gt(local = "de"):

mtcars |> 
  mutate(mpg = mpg*1000) |> 
  gt(locale = "de") |>
  fmt_number(mpg, decimals = 2, sep_mark = "'") |>
  opt_interactive()

Does someone knows a workaround to have the interactive table in german while using the " ' " separator?

[lgnbhl]

This bug is linked to the functionality mentioned here: #1389