Attachment arrow/count persists after delete

[ahoward]

Add an attachment (note or file) to an item. Expand. Right click on attachment and delete from library. The arrow/plus sign and the attachment count will persist, even though the attachment has been deleted.

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Update: Collections do the same thing.

[dstillman]

(In [4509]) - Fix an error with translate.translate(true)

• Add Zotero.Libraries.isEditable(libraryID) (currently unused)
• Addresses #1444, Attachment arrow/count persists after delete, for items (problem probably remains for collections)
• Dragging PDF favicon or link or clicking Create New Item from Current Page when viewing a PDF creates a top-level PDF -- this is a temporary solution that allows "Retrieve PDF Metadata" to be used until it can be run automatically
• Allow PDF child snapshots to be dragged out of parents
• Dragging a link to a collection now creates parent item and child snapshot
• ZoteroPane.newItem(), addItemFromDocument(), addItemFromPage(), addItemFromURL(), and canEdit() now all take an optional row parameter

[dstillman]

(In [4678]) Fixes #1444, Attachment arrow/count persists after delete

This was fixed but then broken again for trashed items. Now fixed again.