Output, warnings, etc. in the epitkit are currently returned in English.
For example, in https://epiverse-trace.github.io/epitkit/limpieza.html#valores-na, we can read:
Warning in base::table(.): NAs introduced by coercion
Should the R session language be set to Spanish in all this lesson?
When R is set to Spanish, the same warning reads:
NAs introducidos por coerción
I think this choice will depend on whether most learners for this lesson are running R in Spanish or in English.