add missing gettext and Menu module

frontend/ui/input.lua

@@ -6,6 +6,7 @@ local Screen = require("ui/screen")
 local Math = require("optmath")
 local Dbg = require("dbg")
 local DEBUG = require("dbg")
+local _ = require("gettext")
 
 -- constants from <linux/input.h>
 local EV_SYN = 0

reader.lua

@@ -4,6 +4,7 @@ require "defaults"
 package.path = "./frontend/?.lua;./?.lua"
 package.cpath = "/usr/lib/lua/?.so"
 local UIManager = require("ui/uimanager")
+local Menu = require("ui/widget/menu")
 local InfoMessage = require("ui/widget/infomessage")
 local ReaderUI = require("ui/readerui")
 local DocumentRegistry = require("document/documentregistry")