From de34c0ec7b59c75d70ec5a96da09e218c2813d1a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Wang?= <fred.wang@free.fr>
Date: Fri, 2 Aug 2013 17:04:46 +0200
Subject: [PATCH 1/2] Implement language fallback. Fix issue #492.

---
 unpacked/MathJax.js | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/unpacked/MathJax.js b/unpacked/MathJax.js
index 7210d8013..0e857e02a 100644
--- a/unpacked/MathJax.js
+++ b/unpacked/MathJax.js
@@ -1068,7 +1068,9 @@ MathJax.Localization = {
     en: {menuTitle: "English", isLoaded: true},   // nothing needs to be loaded for this
     de: {menuTitle: "Deutsch"},
     fr: {menuTitle: "Fran\u00E7ais"},
-    it: {menuTitle: "Italiano"}
+    it: {menuTitle: "Italiano"},
+    pt: {menuTitle: "portugus\u00EA", remap: "pt-br"},
+    "pt-br": {menuTitle: "portugu\u00EAs do Brasil"}
   },
 
   //
@@ -1394,8 +1396,20 @@ MathJax.Localization = {
   //  Set the current language
   //
   setLocale: function(locale) {
-    // don't set it if there isn't a definition for it
-    if (this.strings[locale]) {this.locale = locale}
+    // Selection algorithm:
+    // 1) Downcase locale name (e.g. "en-US" => "en-us")
+    // 2) Try a parent language (e.g. "en-us" => "en")
+    // 3) Try the fallback specified in the data (e.g. "pt" => "pt-br")
+    // 4) Otherwise don't change the locale.
+    if (!locale) return;
+    locale = locale.toLowerCase();
+    while (!this.strings[locale]) {
+      var dashPos = locale.lastIndexOf("-");
+      if (dashPos === -1) return;
+      locale = locale.substring(0, dashPos);
+    }
+    var remap = this.strings[locale].remap;
+    this.locale = remap ? remap : locale;
     if (MathJax.Menu) {this.loadDomain("MathMenu")}
   },
 

From 0af5c438fa947790920d295e399f8f33ba641bc2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Wang?= <fred.wang@free.fr>
Date: Thu, 8 Aug 2013 12:56:13 +0200
Subject: [PATCH 2/2] Fix how the locale is set from menu config / query param.
 #492

---
 unpacked/MathJax.js | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/unpacked/MathJax.js b/unpacked/MathJax.js
index 0e857e02a..018062722 100644
--- a/unpacked/MathJax.js
+++ b/unpacked/MathJax.js
@@ -1393,9 +1393,9 @@ MathJax.Localization = {
   },
 
   //
-  //  Set the current language
+  //  Reset the current language
   //
-  setLocale: function(locale) {
+  resetLocale: function(locale) {
     // Selection algorithm:
     // 1) Downcase locale name (e.g. "en-US" => "en-us")
     // 2) Try a parent language (e.g. "en-us" => "en")
@@ -1410,6 +1410,13 @@ MathJax.Localization = {
     }
     var remap = this.strings[locale].remap;
     this.locale = remap ? remap : locale;
+  },
+
+  //
+  //  Set the current language
+  //
+  setLocale: function(locale) {
+    this.resetLocale(locale);
     if (MathJax.Menu) {this.loadDomain("MathMenu")}
   },
 
@@ -2297,7 +2304,7 @@ MathJax.Hub.Startup = {
     //    set the locale and the default menu value for the locale
     //
     if (this.params.locale) {
-      MathJax.Localization.locale = this.params.locale;
+      MathJax.Localization.resetLocale(this.params.locale);
       MathJax.Hub.config.menuSettings.locale = this.params.locale;
     }
     //
@@ -2375,7 +2382,7 @@ MathJax.Hub.Startup = {
       ["Get",MathJax.HTML.Cookie,"menu",MathJax.Hub.config.menuSettings],
       [function (config) {
         if (config.menuSettings.locale)
-          {MathJax.Localization.locale = config.menuSettings.locale}
+          {MathJax.Localization.resetLocale(config.menuSettings.locale)}
         var renderer = config.menuSettings.renderer, jax = config.jax;
         if (renderer) {
           var name = "output/"+renderer; jax.sort();