initial changes required for i18n system

_locales/en/messages.json

@@ -0,0 +1,2 @@
+{
+}

js/localization.js

@@ -0,0 +1,32 @@
+function localize() {
+    var localized = 0;
+
+    var translate = function(messageID) {
+        localized++;
+
+        return chrome.i18n.getMessage(messageID);
+    };
+
+    $('[i18n]:not(.i18n-replaced').each(function() {
+        var element = $(this);
+
+        element.html(translate(element.attr('i18n')));
+        element.addClass('i18n-replaced');
+    });
+
+    $('[i18n_title]:not(.i18n_title-replaced').each(function() {
+        var element = $(this);
+
+        element.attr('title', translate(element.attr('i18n_title')));
+        element.addClass('i18n_title-replaced');
+    });
+
+    $('[i18n_value]:not(.i18n_value-replaced').each(function() {
+        var element = $(this);
+
+        element.val(translate(element.attr('i18n_value')));
+        element.addClass('i18n_value-replaced');
+    });
+
+    return localized;
+}

main.html

@@ -15,9 +15,10 @@
         <script type="text/javascript" src="./js/serial_backend.js"></script>
         <script type="text/javascript" src="./js/data_storage.js"></script>
         <script type="text/javascript" src="./js/msp.js"></script>
-        <script type="text/javascript" src="./main.js"></script>
         <script type="text/javascript" src="./js/backup_restore.js"></script>
         <script type="text/javascript" src="./js/stm32.js"></script>
+        <script type="text/javascript" src="./js/localization.js"></script>
+        <script type="text/javascript" src="./main.js"></script>
 
         <!-- Various tabs are divided into separate files (for clarity) -->
         <script type="text/javascript" src="./tabs/default.js"></script>

manifest.json

@@ -10,6 +10,8 @@
 
     "offline_enabled": true,
 
+    "default_locale": "en",
+
     "app": {
         "background": {
             "scripts": [ "background.js" ]