icon: lock icon update

UI/ItemButton.lua

@@ -497,14 +497,14 @@ local function AcquireLockIcon()
 		shadow:SetWidth(13)
 		shadow:SetHeight(13)
 		shadow:SetPoint("CENTER", icon, "CENTER", 1, -1)
-		shadow:SetTexture("Interface\\Icons\\INV_Misc_Key_04")
+		shadow:SetTexture("Interface\\AddOns\\Guda\\Assets\\lock")
 		shadow:SetVertexColor(0, 0, 0, 1)
 		icon.shadow = shadow
 
 		-- Icon (front)
 		local texture = icon:CreateTexture(nil, "OVERLAY")
 		texture:SetAllPoints(icon)
-		texture:SetTexture("Interface\\Icons\\INV_Misc_Key_04")
+		texture:SetTexture("Interface\\AddOns\\Guda\\Assets\\lock")
 		icon.texture = texture
 	end
 	return icon

UI/SettingsPopup.lua

@@ -52,6 +52,11 @@ function Guda_SettingsPopup_OnLoad(self)
                      "Tracked items will appear in the Tracked Item Bar.\n" ..
                      "Left Click on an item in the bar to use it.\n" ..
                      "Alt + Left Click on an item in the bar to untrack it.\n\n" ..
+                     "|cffffd100Locked Items:|r\n" ..
+                     "Ctrl + Right Click on any item to lock/unlock it.\n" ..
+                     "Locked items cannot be sold at vendors or deleted.\n" ..
+                     "Equipment set items are automatically protected.\n" ..
+                     "A lock icon appears on the bottom-right corner.\n\n" ..
                      "|cffffd100Moving Bars:|r\n" ..
                      "Shift + Left Click and drag any item on the Quest Item Bar or Tracked Item Bar to move the bar.\n"
         instructions:SetText(text)