ci4-bugfix to items customers and attributes

Attributes: Noticed log_message() being called with uppercase letters in the level which causes errors in the system; Customers: improved the layout of the stats page in the information dialog issue 3892; Items: got csv import working issue 3896 and bulk edits working - barcode generation does not work yet.
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f