"Working" list display using a TreeGroup control. There's a small limitation where I can't accurately detect which subtree is open unless the user has made a selection in that tab. Not sure I love that. Loot lists are displayed with colored names. People not in the raid are grayed out.

local AceLocale = LibStub:GetLibrary("AceLocale-3.0")
local L = AceLocale:NewLocale("bsk","enUS",true)
if not L then return end

-- English
L["test"] = true