Well in this case the smartphone installation wasn't completed in total!
But you can easily copy the language files that you want to have on your smartphone with the windows explorer: Just go to the desktop folder in that you have installed SiDiary. You will find several language files called SiDiaryXX.txt (xx are wildcards for the language abbreviation, i.e. SiDiaryEN.txt, SiDiaryNL.txt etc.)
Copy those files, go to the folder where SiDiary has been installed on your smartphone (default target is \Storage\Program Files\SiDiary but perhaps you have chosen to install it on a storage card?) and insert the language files in that folder.
Restart SiDiary on the smartphone and go back to the settings - the languages should be there now...
HTH.
Cheers, Alf.