Limit file name to text to prevent XSS

Reflected XSS when uploading a wrong file.

This vulnerability affects the following application versions:

• PrestaShop 1.7.4.0
• PrestaShop 1.7.4.0 beta 1
• PrestaShop 1.7.4.1
• PrestaShop 1.7.4.2
• PrestaShop 1.7.4.3
• PrestaShop 1.7.4.4
• PrestaShop 1.7.5.0
• PrestaShop 1.7.5.0 beta 1
• PrestaShop 1.7.5.0 RC 1
• PrestaShop 1.7.5.0-beta.1
• PrestaShop 1.7.5.0-RC.1
• PrestaShop 1.7.5.1
• PrestaShop 1.7.5.2
• PrestaShop 1.7.6.0
• PrestaShop 1.7.6.0 beta 1
• PrestaShop 1.7.6.0 RC 1
• PrestaShop 1.7.6.0 RC 2
• PrestaShop 1.7.6.0-beta.1
• PrestaShop 1.7.6.0-RC.1
• PrestaShop 1.7.6.0-RC.2
• PrestaShop 1.7.6.1
• PrestaShop 1.7.6.2
• PrestaShop 1.7.6.3
• PrestaShop 1.7.6.4
• PrestaShop 1.7.6.4 1