I would like to know how I can solve the problem of accents and special characters, I don't know why special characters (´,ñ, etc) appear wrong, with the code I don't have any problem but when running the shiny app all the labels where this type of characters are appear as an attachment in the image below. I have read about saving with utf-8 encoding but the problem is still not fixed, below I share information about my session.
wrong labels: Número, Gráfico, Comunicación

R version 3.6.3 (2020-02-29)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19044)
Matrix products: default
locale:
[1] LC_COLLATE=Spanish_Spain.1252 LC_CTYPE=Spanish_Spain.1252
[3] LC_MONETARY=Spanish_Spain.1252 LC_NUMERIC=C
[5] LC_TIME=Spanish_Spain.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods
[7] base
other attached packages:
[1] stringi_1.6.1 plotly_4.10.0 ggplot2_3.3.5
[4] dplyr_1.0.7 shinyFiles_0.9.1 visNetwork_2.1.0
[7] openxlsx_4.2.4 shinyalert_2.0.0 lubridate_1.7.10
[10] data.table_1.14.2 DT_0.20 shinyjs_2.0.0
[13] shiny_1.7.1
loaded via a namespace (and not attached):
[1] Rcpp_1.0.6 lattice_0.20-38 tidyr_1.1.4
[4] assertthat_0.2.1 digest_0.6.27 utf8_1.2.1
[7] mime_0.10 R6_2.5.1 evaluate_0.14
[10] httr_1.4.2 pillar_1.6.4 rlang_0.4.11
[13] uuid_0.1-4 lazyeval_0.2.2 fontawesome_0.2.2
[16] rstudioapi_0.13 jquerylib_0.1.4 rmarkdown_2.11
[19] foreign_0.8-75 htmlwidgets_1.5.4 munsell_0.5.0
[22] compiler_3.6.3 httpuv_1.6.1 xfun_0.30
[25] pkgconfig_2.0.3 htmltools_0.5.2 tidyselect_1.1.1
[28] tibble_3.1.1 fansi_0.4.2 viridisLite_0.4.0
[31] crayon_1.4.2 withr_2.4.2 later_1.2.0
[34] grid_3.6.3 jsonlite_1.7.2 xtable_1.8-4
[37] gtable_0.3.0 lifecycle_1.0.1 DBI_1.1.2
[40] magrittr_2.0.1 scales_1.1.1 zip_2.2.0
[43] cli_3.1.0 cachem_1.0.4 fs_1.5.0
[46] promises_1.2.0.1 sp_1.4-6 bslib_0.3.1
[49] ellipsis_0.3.2 generics_0.1.1 vctrs_0.3.8
[52] tools_3.6.3 glue_1.4.2 purrr_0.3.4
[55] crosstalk_1.1.1 rsconnect_0.8.25 fastmap_1.1.0
[58] yaml_2.2.1 colorspace_2.0-1 maptools_1.1-2
[61] knitr_1.36 sass_0.4.0