Currently only English and Dutch property names and item names (if they need to be translated into QID's) are accepted. Dates need to be in format: d-m-Y or Y-m-d (no trailing zeros needed, but no problem if they are added. First row needs to be the properties, other rows need to be the statements. It's allowed to use item id and property id, they will return unaltered.
If no language is specified the default used language will be Dutch. Request additional languages on GitHub.
If you use the update option to create update statements instead of create statements, you must have a column named "item" which constains the item that needs to be updated. This doesn't have to be a QID, can also be the name of the item just like for create.