automatically set language on Android

android/luajit-launcher

@@ -1 +1 @@
-Subproject commit 5bd850e1e57d4ceb1b867f3bc38a31a8795a9fe9
+Subproject commit 9c3178079c8c46226c74717bfc16903535b4ee14

frontend/gettext.lua

@@ -1,3 +1,4 @@
+local isAndroid, android = pcall(require, "android")
 local DEBUG = require("dbg")
 
 local GetText = {
@@ -96,4 +97,16 @@ elseif os.getenv("LANG") then
     GetText.changeLang(os.getenv("LANG"))
 end
 
+if isAndroid then
+    local ffi = require("ffi")
+    local buf = ffi.new("char[?]", 16)
+    ffi.C.AConfiguration_getLanguage(android.app.config, buf)
+    local lang = ffi.string(buf)
+    ffi.C.AConfiguration_getCountry(android.app.config, buf)
+    local country = ffi.string(buf)
+    if lang and country then
+        GetText.changeLang(lang.."_"..country)
+    end
+end
+
 return GetText