also str representation of unicode character is different.

This reverts commit 149fdd1d.

This did not support the case of updating old emails for which
url_string was set, it was setting coordinate_text and causing
emails to have two properties ( url_string to the old value
and coordinate_text to the new value ).

See discussion on nexedi/erp5@149fdd1d (comment 180744)

- make the editor bigger
- use monospace font for params

This can happen with cross origin document, when using open on another
domain. In that case selenium crashes and the test never finishes, this
allows selenium to finish and report the error.

With 12f110d4 (testTableStructureMigration: update test after
mariadb 10.3.38, 2023-02-22) we changed the test to support mariadb >=
10.3.38 but it broke the test under 10.3.35.

This makes the test support both 10.3.35 and 10.3.38.