Why did this happen?

Anyways, I am re-installing some plug-ins from here but I forgot how. I know I have to move them to a folder inside the TheoTown folder but is the folder supposed to be called "plugin" or "plugins"

Sorry if I am wrong, I used google translate.
/storage/emulated/0/android/data/info.flowersoft.theotown.theotown/files/plugins