Fix "Hide" label sticking on the collection context menu's Delete item

After the menu was built for a hideable row (My Publications, Unfiled
Items, etc.), the Delete Collection/Search item kept showing "Hide" for
collections and saved searches. Set "Hide" via Fluent like the other
labels.

https://forums.zotero.org/discussion/134097/

chrome/content/zotero/zoteroPane.js

@@ -4094,14 +4094,14 @@ var ZoteroPane = new function () {
 				show.push('clearAllLastRead');
 			}
 			
-			m.deleteCollection.setAttribute('label', Zotero.getString('general.hide'));
+			document.l10n.setAttributes(m.deleteCollection, 'collections-menu-hide');
 			useHideOrDelete = "hide";
 		}
 		else if (collectionTreeRows[0].isHeader()) {
 		}
 		else if (collectionTreeRows[0].isPublications()) {
 			show = ['exportFile', 'deleteCollection'];
-			m.deleteCollection.setAttribute('label', Zotero.getString('general.hide'));
+			document.l10n.setAttributes(m.deleteCollection, 'collections-menu-hide');
 			useHideOrDelete = "hide";
 		}
 		// Library

chrome/locale/en-US/zotero/zotero.ftl

@@ -66,6 +66,7 @@ general-copy = Copy
 general-paste = Paste
 general-find = Find
 general-delete = Delete
+general-hide = Hide
 general-insert = Insert
 general-and = and
 general-et-al = et al.
@@ -276,6 +277,8 @@ collections-menu-delete-search =
         [one] Delete Search…
        *[other] Delete Searches…
     }
+collections-menu-hide =
+    .label = { general-hide }
 
 collections-delete-title =
     { $count ->

chrome/locale/en-US/zotero/zotero.properties

@@ -56,7 +56,6 @@ general.enable						= Enable
 general.disable						= Disable
 general.remove						= Remove
 general.reset						= Reset
-general.hide                          = Hide
 general.quit						= Quit
 general.useDefault					= Use Default
 general.openDocumentation			= Open Documentation