Add culture-aware string comparison tests.
Add culture-aware string comparison tests.

This concerns issue #3342.

sitofabi/duplicati,sitofabi/duplicati,duplicati/duplicati,mnaiman/duplicati,mnaiman/duplicati,sitofabi/duplicati,sitofabi/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,duplicati/duplicati,sitofabi/duplicati