Improve Stats pages

[NicoPennec]

Problem
In the Stats pages,

• The column order may be wrong on Kitsu or CSV export file.
• Export button will fail while loading data.
• The export of Retake stats may be wrong with empty cells.
• A long header name may overflow the column.

Solution

• Fix the column order in stats pages, based on production or studio settings.
• Disable the export button during stats loading.
• Fix the Retake stats export with data on matching columns in the CSV file.
• Improve style of table headers with long text (ellipsis + title).

[frankrousseau]

Thank you!