Display text for attachment upload

Admins can configure text to be displayed in the attachment field in an issue view.

This is useful for:

{color:#de350b}*Upload limit is 20MB per attachment*{color}

{panel}
(!) Note:
 # Please do not upload installation files.
 # For large files, please use [safe transfer|https://your-link.com/].
{panel}

The text can be set at Attachment Checker Configuration → Look and Feel