(Koha item type) Use "item type" for interface elements and when referring to Koha item types, for example, in form labels, table column headings, hints, and text. Do not use "itemtype" unless directly referencing the database "itemtype" field name, the same as you would do with any other database table or field name.
library
Base terminology
Use "library", not "branch".
patron
Base terminology
Use "patron", not "user", "member", or "borrower".