luci: fall back to English if no language matches

patches/packages/luci/0002-modules-base-dispatcher-set-default-language-if-none-provided-by-the-browser-matches.patch

+From: Matthias Schiffer <mschiffer@universe-factory.net>
+Date: Thu, 19 Mar 2015 18:44:52 +0100
+Subject: modules/base: dispatcher: set default language if none provided by the browser matches
+
+diff --git a/modules/base/luasrc/dispatcher.lua b/modules/base/luasrc/dispatcher.lua
+index f7e16e7..479ac54 100644
+--- a/modules/base/luasrc/dispatcher.lua
++++ b/modules/base/luasrc/dispatcher.lua
+@@ -211,6 +211,7 @@ function dispatch(request)
+ 	assert(conf.main,
+ 		"/etc/config/luci seems to be corrupt, unable to find section 'main'")
+ 
++	local i18n = require "luci.i18n"
+ 	local lang = conf.main.lang or "auto"
+ 	if lang == "auto" then
+ 		local aclang = http.getenv("HTTP_ACCEPT_LANGUAGE") or ""
+@@ -222,7 +223,10 @@ function dispatch(request)
+ 			end
+ 		end
+ 	end
+-	require "luci.i18n".setlanguage(lang)
++	if lang == "auto" then
++		lang = i18n.default
++	end
++	i18n.setlanguage(lang)
+ 
+ 	local c = ctx.tree
+ 	local stat