[R] "found 4 marked UTF-8 strings" during check of package... but where !

[Marc Girondot]

Dear members,

I want submit to CRAN a new version of a package that I maintain. When I 
check locally "as-cran" no note or error are reported but the link after 
submission reports several notes and one warning:

For example:

using R Under development (unstable) (2017-03-05 r72309)
using platform: x86_64-apple-darwin16.4.0 (64-bit)
using session charset: UTF-8
...
checking extension type ... Package
this is package ‘embryogrowth’ version ‘6.4’
package encoding: UTF-8
...
checking data for non-ASCII characters ... NOTE
   Note: found 4 marked UTF-8 strings

I have the same with
using R version 3.3.0 (2016-05-03)
using platform: x86_64-apple-darwin13.4.0 (64-bit)

but not with some others such as r-devel-linux-x86_64-debian-gcc

Based on the message, "Note: found 4 marked UTF-8 strings", it seems 
that "4 marked UTF-8 strings" are present in the package and it is a 
problem...

Is there any solution to know in which file?

Thanks
Marc