CSV export fails when a form field is named, Date, author, or anonymous

[CharlesGrimont]

Export CSV fails when a form field is named, Date, author, or anonymous

Behaviour:

• CSV export fails when a form field is named named, Date, author, or anonymous

Step to reproduce:

• Create a new form
• Create an input text, and set its technical name to Date
• Export CSV
• Export fails

Cause:

• It's because, we already have an internal field Date (use to show export Date) and we we sort responses, Date field is set instead of our internal Date field.
• So when we try to convert date into human readable date, it fails because date is not anymore of type Date

related to Exporting csv "horodateur" date is not of type date #617

[CharlesGrimont]

To be tested in 1.0.54

[gregory-vorbe]

OK in 2.0.0-beta88