createSpeciesFolders function does not work correctly with Khmer script

[git-og]

When using species names with Khmer script, the folder are not created by the createSpeciesFolders function.

With the following species names (or classification groups) used in createSpeciesFolders, only folders for 0_Empty, 1_Deployment and collection, and Bird_unidentified will be created. The folders for the two that contain Khmer characters are not created.

0_Empty
1_Deployment and collection
Banteng_ទន្សោង
Bird_unidentified
Chevrotain_ក្តាន់ញែងតូច

I assume this generalises to other non-Latin characters and to other functions, but I haven't tested it. For a quick workaround, I concatenated the classification groups with a file path, then used lapply(df$path, FUN = dir.create) to create the folders from a list of file paths.