diff --git a/source/Ox/js/Format.js b/source/Ox/js/Format.js
index 21e79c9b..5a42915d 100644
--- a/source/Ox/js/Format.js
+++ b/source/Ox/js/Format.js
@@ -26,8 +26,9 @@ Ox.formatCount <f> Returns a string like "2 items", "1 item" or "no items".
     '1,000 cities'
 @*/
 Ox.formatCount = function(number, singular, plural) {
-    return (number === 0 ? 'no' : Ox.formatNumber(number)) + ' '
-        + (number === 1 ? singular : plural || singular + 's');
+    plural = (plural || singular + 's') + (number === 2 ? '{2}' : '');
+    return (number === 0 ? Ox._('no') : Ox.formatNumber(number))
+        + ' ' + Ox._(number === 1 ? singular : plural);
 };
 
 /*@
@@ -44,7 +45,8 @@ Ox.formatDate <f> Formats a date according to a format string
     See 
     <a href="http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/strftime.3.html">strftime</a>
     and <a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a>.
-    '%Q' (quarter) and '%X'/'%x' (year with 'BC'/'AD') are non-standard
+    'E*%' (localized date and time), %Q' (quarter) and '%X'/'%x'
+    (year with 'BC'/'AD') are non-standard.
     (string) -> <s> formatted date
     (date, string) -> <s> formatted date
     (date, string, utc) -> <s> formatted date
@@ -71,6 +73,26 @@ Ox.formatDate <f> Formats a date according to a format string
     '01/02/05'
     > Ox.formatDate(Ox.test.date, '%d') // Zero-padded day of the month
     '02'
+    > Ox.formatDate(Ox.test.date, '%ED') // Localized date and time with seconds
+    '01/02/2005 00:03:04'
+    > Ox.formatDate(Ox.test.date, '%Ed') // Localized date and time without seconds
+    '01/02/2005 00:03
+    > Ox.formatDate(Ox.test.date, '%EL') // Long localized date with weekday
+    'Sunday, January 2, 2005'
+    > Ox.formatDate(Ox.test.date, '%El') // Long localized date without weekday
+    'January 2, 2005'
+    > Ox.formatDate(Ox.test.date, '%EM') // Medium localized date with weekday
+    'Sun, Jan 2, 2005'
+    > Ox.formatDate(Ox.test.date, '%Em') // Medium localized date without weekday
+    'Jan 2, 2005'
+    > Ox.formatDate(Ox.test.date, '%ES') // Short localized date with century
+    '01/02/2005'
+    > Ox.formatDate(Ox.test.date, '%Es') // Short localized date without century
+    '01/02/05'
+    > Ox.formatDate(Ox.test.date, '%ET') // Localized time with seconds
+    '12:03:04 AM'
+    > Ox.formatDate(Ox.test.date, '%Et') // Localized time without seconds
+    '12:03 AM'
     > Ox.formatDate(Ox.test.date, '%e') // Space-padded day of the month
     ' 2'
     > Ox.formatDate(Ox.test.date, '%F') // Date
@@ -155,6 +177,36 @@ Ox.formatDate <f> Formats a date according to a format string
         ['D', function() {
             return '%m/%d/%y';
         }],
+        ['ED', function() {
+            return '%ES %T';
+        }],
+        ['Ed', function() {
+            return '%ES %R';
+        }],
+        ['EL', function() {
+            return Ox._('%A, %B %e, %Y');
+        }],
+        ['El', function() {
+            return Ox._('%B %e, %Y');
+        }],
+        ['EM', function() {
+            return Ox._('%a, %b %e, %Y');
+        }],
+        ['Em', function() {
+            return Ox._('%b %e, %Y');
+        }],
+        ['ES', function() {
+            return Ox._('%m/%d/%Y');
+        }],
+        ['Es', function() {
+            return Ox._('%m/%d/%y');
+        }],
+        ['ET', function() {
+            return Ox._('%I:%M:%S %p');
+        }],
+        ['Et', function() {
+            return Ox._('%I:%M %p');
+        }],
         ['F', function() {
             return '%Y-%m-%d';
         }],
@@ -177,16 +229,16 @@ Ox.formatDate <f> Formats a date according to a format string
             return '%a %b %e %H:%M:%S %Z %Y';
         }],
         ['A', function(date, utc) {
-            return Ox.WEEKDAYS[(Ox.getDay(date, utc) + 6) % 7];
+            return Ox._(Ox.WEEKDAYS[(Ox.getDay(date, utc) + 6) % 7]);
         }],
         ['a', function(date, utc) {
-            return Ox.SHORT_WEEKDAYS[(Ox.getDay(date, utc) + 6) % 7];
+            return Ox._(Ox.SHORT_WEEKDAYS[(Ox.getDay(date, utc) + 6) % 7]);
         }],
         ['B', function(date, utc) {
-            return Ox.MONTHS[Ox.getMonth(date, utc)];
+            return Ox._(Ox.MONTHS[Ox.getMonth(date, utc)]);
         }],
         ['b', function(date, utc) {
-            return Ox.SHORT_MONTHS[Ox.getMonth(date, utc)];
+            return Ox._(Ox.SHORT_MONTHS[Ox.getMonth(date, utc)]);
         }],
         ['C', function(date, utc) {
             return Math.floor(Ox.getFullYear(date, utc) / 100).toString();
@@ -225,7 +277,7 @@ Ox.formatDate <f> Formats a date according to a format string
             return Ox.pad((Ox.getMonth(date, utc) + 1), 2);
         }],
         ['p', function(date, utc) {
-            return Ox.AMPM[Math.floor(Ox.getHours(date, utc) / 12)];
+            return Ox._(Ox.AMPM[Math.floor(Ox.getHours(date, utc) / 12)]);
         }],
         ['Q', function(date, utc) {
             return Math.floor(Ox.getMonth(date, utc) / 4) + 1;
@@ -256,11 +308,13 @@ Ox.formatDate <f> Formats a date according to a format string
         }],
         ['X', function(date, utc) {
             var y = Ox.getFullYear(date, utc);
-            return Math.abs(y) + ' ' + Ox.BCAD[y < 0 ? 0 : 1];
+            return Math.abs(y) + ' ' + Ox._(Ox.BCAD[y < 0 ? 0 : 1]);
         }],
         ['x', function(date, utc) {
             var y = Ox.getFullYear(date, utc);
-            return Math.abs(y) + (y < 1000 ? ' ' + Ox.BCAD[y < 0 ? 0 : 1] : '');
+            return Math.abs(y) + (
+                y < 1000 ? ' ' + Ox._(Ox.BCAD[y < 0 ? 0 : 1]) : ''
+            );
         }],
         ['Y', function(date, utc) {
             return Ox.getFullYear(date, utc);
@@ -569,8 +623,11 @@ Ox.formatDuration = function(seconds/*, decimals, format*/) {
         if (format == 'none') {
             ret = Ox.pad(value, 'left', pad[index], '0');
         } else if (Ox.isNumber(value) ? value : parseFloat(value)) {
-            ret = value + (format == 'long' ? ' ' : '') + string[index]
-                + (format == 'long' && value != 1 ? 's' : '');
+            ret = value + (format == 'long' ? ' ' : '') + Ox._(string[index] + (
+                format == 'long'
+                ? (value == 1 ? '' : value == 2 ? 's{2}' : 's')
+                : ''
+            ));
         } else {
             ret = '';
         }
@@ -598,8 +655,8 @@ Ox.formatNumber = function(number, decimals) {
         array.unshift(split[0].slice(-3));
         split[0] = split[0].slice(0, -3);
     }
-    split[0] = array.join(',');
-    return (number < 0 ? '-' : '') + split.join('.');
+    split[0] = array.join(Ox._(','));
+    return (number < 0 ? '-' : '') + split.join(Ox._('.'));
 };
 
 /*@
@@ -623,15 +680,18 @@ Ox.formatOrdinal = function(number) {
     var string = Ox.formatNumber(number),
         length = string.length,
         last = string[length - 1],
-        ten = length > 1 && string[length - 2] == '1';
+        ten = length > 1 && string[length - 2] == '1',
+        twenty = length > 1 && !ten;
     if (last == '1' && !ten) {
-        string += 'st';
+        string += Ox._('st' + (twenty ? '{21}' : ''));
     } else if (last == '2' && !ten) {
-        string += 'nd';
+        string += Ox._('nd' + (twenty ? '{22}' : ''));
     } else if (last == '3' && !ten) {
-        string += 'rd';
+        string += Ox._('rd' + (twenty ? '{23}' : ''));
     } else {
-        string += 'th';
+        string += Ox._(
+            'th' + (Ox.contains('123', last) && ten ? '{1' + last + '}' : '')
+        );
     }
     return string;
 };
@@ -642,7 +702,7 @@ Ox.formatPercent <f> Formats the relation of two numbers as a percentage
     "0.10%"
 @*/
 Ox.formatPercent = function(number, total, decimals) {
-    return Ox.formatNumber(number / total * 100, decimals) + '%'
+    return Ox.formatNumber(number / total * 100, decimals) + Ox._('%');
 };
 
 /*@
@@ -686,18 +746,29 @@ Ox.formatString <f> Basic string formatting
     'foobar'
     > Ox.formatString('{a\\.b}', {'a.b': 'foobar'})
     'foobar'
+    > Ox.formatString('{1}', ['foobar'])
+    '{1}'
+    > Ox.formatString('{b}', {a: 'foobar'}, true)
+    ''
 @*/
-Ox.formatString = function(string, collection) {
+Ox.formatString = function(string, collection, removeUnmatched) {
     return string.replace(/\{([^}]+)\}/g, function(string, match) {
         // make sure to not split at escaped dots ('\.')
-        var keys = match.replace(/\\\./g, '\n').split('.').map(function(key) {
-                return key.replace(/\n/g, '.')
+        var key,
+            keys = match.replace(/\\\./g, '\n').split('.').map(function(key) {
+                return key.replace(/\n/g, '.');
             }),
-            value = collection;
+            value = collection || {};
         while (keys.length) {
-            value = value[keys.shift()];
+            key = keys.shift();
+            if (value[key]) {
+                value = value[key];
+            } else {
+                value = null;
+                break;
+            }
         }
-        return value;
+        return value || (removeUnmatched ? '' : '{' + match + '}');
     });
 };
 
diff --git a/source/Ox/js/Locale.js b/source/Ox/js/Locale.js
new file mode 100644
index 00000000..690a164a
--- /dev/null
+++ b/source/Ox/js/Locale.js
@@ -0,0 +1,73 @@
+'use strict';
+
+(function() {
+
+    var log, translations = {};
+
+    /*@
+    Ox.setLocale <f> Sets locale
+        (locale[, url], callback)
+        locale <s> Locale (like 'de' or 'fr')
+        url <s> URL of JSON file with additional translations
+        callback <f> Callback function
+            success <b> If true, locale has been set
+    @*/
+    Ox.setLocale = function(locale, url, callback) {
+        var isValidLocale = Ox.contains(Object.keys(Ox.LOCALES), locale);
+        if (arguments.length == 2) {
+            callback = arguments[1];
+            url = null;
+        }
+        if (locale != Ox.LOCALE && isValidLocale) {
+            Ox.LOCALE = locale;
+            if (locale == 'en') {
+                translations = {};
+                callback(true);
+            } else {
+                Ox.getJSON(
+                    Ox.PATH + 'Ox/json/locale.' + locale + '.json',
+                    function(data) {
+                        translations = data;
+                        if (url) {
+                            Ox.getJSON(url, function(data) {
+                                Ox.extend(translations, data);
+                                callback(true);
+                            });
+                        } else {
+                            callback(true);
+                        }
+                    }
+                );
+            }
+        } else {
+            callback(isValidLocale);
+        }
+    };
+
+    /*@
+    Ox._ <f> Localizes a string
+        (string[, options]) -> <s> Localized string
+        string <s> English string
+        options <o> Options passed to Ox.formatString
+    @*/
+    Ox._ = function(value, options) {
+        var translation = translations[value];
+        log && log(value, translation);
+        translation = translation || value;
+        return options
+            ? Ox.formatString(translation, options, true)
+            : translation
+    };
+
+    /*@
+    Ox._.log <f> Registers a logging function
+        (callback) -> <u> undefined
+        callback <f> Callback function
+            english <s> English string
+            translation <s> Translated string
+    @*/
+    Ox._.log = function(callback) {
+        log = callback;
+    };
+
+})();
\ No newline at end of file