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diff --git a/addons/web/static/lib/underscore.string/lib/underscore.string.js b/addons/web/static/lib/underscore.string/lib/underscore.string.js
new file mode 100644
index 00000000..87611173
--- /dev/null
+++ b/addons/web/static/lib/underscore.string/lib/underscore.string.js
@@ -0,0 +1,673 @@
+//  Underscore.string
+//  (c) 2010 Esa-Matti Suuronen <esa-matti aet suuronen dot org>
+//  Underscore.string is freely distributable under the terms of the MIT license.
+//  Documentation: https://github.com/epeli/underscore.string
+//  Some code is borrowed from MooTools and Alexandru Marasteanu.
+//  Version '2.3.2'
+
+!function(root, String){
+  'use strict';
+
+  // Defining helper functions.
+
+  var nativeTrim = String.prototype.trim;
+  var nativeTrimRight = String.prototype.trimRight;
+  var nativeTrimLeft = String.prototype.trimLeft;
+
+  var parseNumber = function(source) { return source * 1 || 0; };
+
+  var strRepeat = function(str, qty){
+    if (qty < 1) return '';
+    var result = '';
+    while (qty > 0) {
+      if (qty & 1) result += str;
+      qty >>= 1, str += str;
+    }
+    return result;
+  };
+
+  var slice = [].slice;
+
+  var defaultToWhiteSpace = function(characters) {
+    if (characters == null)
+      return '\\s';
+    else if (characters.source)
+      return characters.source;
+    else
+      return '[' + _s.escapeRegExp(characters) + ']';
+  };
+
+  // Helper for toBoolean
+  function boolMatch(s, matchers) {
+    var i, matcher, down = s.toLowerCase();
+    matchers = [].concat(matchers);
+    for (i = 0; i < matchers.length; i += 1) {
+      matcher = matchers[i];
+      if (!matcher) continue;
+      if (matcher.test && matcher.test(s)) return true;
+      if (matcher.toLowerCase() === down) return true;
+    }
+  }
+
+  var escapeChars = {
+    lt: '<',
+    gt: '>',
+    quot: '"',
+    amp: '&',
+    apos: "'"
+  };
+
+  var reversedEscapeChars = {};
+  for(var key in escapeChars) reversedEscapeChars[escapeChars[key]] = key;
+  reversedEscapeChars["'"] = '#39';
+
+  // sprintf() for JavaScript 0.7-beta1
+  // http://www.diveintojavascript.com/projects/javascript-sprintf
+  //
+  // Copyright (c) Alexandru Marasteanu <alexaholic [at) gmail (dot] com>
+  // All rights reserved.
+
+  var sprintf = (function() {
+    function get_type(variable) {
+      return Object.prototype.toString.call(variable).slice(8, -1).toLowerCase();
+    }
+
+    var str_repeat = strRepeat;
+
+    var str_format = function() {
+      if (!str_format.cache.hasOwnProperty(arguments[0])) {
+        str_format.cache[arguments[0]] = str_format.parse(arguments[0]);
+      }
+      return str_format.format.call(null, str_format.cache[arguments[0]], arguments);
+    };
+
+    str_format.format = function(parse_tree, argv) {
+      var cursor = 1, tree_length = parse_tree.length, node_type = '', arg, output = [], i, k, match, pad, pad_character, pad_length;
+      for (i = 0; i < tree_length; i++) {
+        node_type = get_type(parse_tree[i]);
+        if (node_type === 'string') {
+          output.push(parse_tree[i]);
+        }
+        else if (node_type === 'array') {
+          match = parse_tree[i]; // convenience purposes only
+          if (match[2]) { // keyword argument
+            arg = argv[cursor];
+            for (k = 0; k < match[2].length; k++) {
+              if (!arg.hasOwnProperty(match[2][k])) {
+                throw new Error(sprintf('[_.sprintf] property "%s" does not exist', match[2][k]));
+              }
+              arg = arg[match[2][k]];
+            }
+          } else if (match[1]) { // positional argument (explicit)
+            arg = argv[match[1]];
+          }
+          else { // positional argument (implicit)
+            arg = argv[cursor++];
+          }
+
+          if (/[^s]/.test(match[8]) && (get_type(arg) != 'number')) {
+            throw new Error(sprintf('[_.sprintf] expecting number but found %s', get_type(arg)));
+          }
+          switch (match[8]) {
+            case 'b': arg = arg.toString(2); break;
+            case 'c': arg = String.fromCharCode(arg); break;
+            case 'd': arg = parseInt(arg, 10); break;
+            case 'e': arg = match[7] ? arg.toExponential(match[7]) : arg.toExponential(); break;
+            case 'f': arg = match[7] ? parseFloat(arg).toFixed(match[7]) : parseFloat(arg); break;
+            case 'o': arg = arg.toString(8); break;
+            case 's': arg = ((arg = String(arg)) && match[7] ? arg.substring(0, match[7]) : arg); break;
+            case 'u': arg = Math.abs(arg); break;
+            case 'x': arg = arg.toString(16); break;
+            case 'X': arg = arg.toString(16).toUpperCase(); break;
+          }
+          arg = (/[def]/.test(match[8]) && match[3] && arg >= 0 ? '+'+ arg : arg);
+          pad_character = match[4] ? match[4] == '0' ? '0' : match[4].charAt(1) : ' ';
+          pad_length = match[6] - String(arg).length;
+          pad = match[6] ? str_repeat(pad_character, pad_length) : '';
+          output.push(match[5] ? arg + pad : pad + arg);
+        }
+      }
+      return output.join('');
+    };
+
+    str_format.cache = {};
+
+    str_format.parse = function(fmt) {
+      var _fmt = fmt, match = [], parse_tree = [], arg_names = 0;
+      while (_fmt) {
+        if ((match = /^[^\x25]+/.exec(_fmt)) !== null) {
+          parse_tree.push(match[0]);
+        }
+        else if ((match = /^\x25{2}/.exec(_fmt)) !== null) {
+          parse_tree.push('%');
+        }
+        else if ((match = /^\x25(?:([1-9]\d*)\$|\(([^\)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(_fmt)) !== null) {
+          if (match[2]) {
+            arg_names |= 1;
+            var field_list = [], replacement_field = match[2], field_match = [];
+            if ((field_match = /^([a-z_][a-z_\d]*)/i.exec(replacement_field)) !== null) {
+              field_list.push(field_match[1]);
+              while ((replacement_field = replacement_field.substring(field_match[0].length)) !== '') {
+                if ((field_match = /^\.([a-z_][a-z_\d]*)/i.exec(replacement_field)) !== null) {
+                  field_list.push(field_match[1]);
+                }
+                else if ((field_match = /^\[(\d+)\]/.exec(replacement_field)) !== null) {
+                  field_list.push(field_match[1]);
+                }
+                else {
+                  throw new Error('[_.sprintf] huh?');
+                }
+              }
+            }
+            else {
+              throw new Error('[_.sprintf] huh?');
+            }
+            match[2] = field_list;
+          }
+          else {
+            arg_names |= 2;
+          }
+          if (arg_names === 3) {
+            throw new Error('[_.sprintf] mixing positional and named placeholders is not (yet) supported');
+          }
+          parse_tree.push(match);
+        }
+        else {
+          throw new Error('[_.sprintf] huh?');
+        }
+        _fmt = _fmt.substring(match[0].length);
+      }
+      return parse_tree;
+    };
+
+    return str_format;
+  })();
+
+
+
+  // Defining underscore.string
+
+  var _s = {
+
+    VERSION: '2.3.0',
+
+    isBlank: function(str){
+      if (str == null) str = '';
+      return (/^\s*$/).test(str);
+    },
+
+    stripTags: function(str){
+      if (str == null) return '';
+      return String(str).replace(/<\/?[^>]+>/g, '');
+    },
+
+    capitalize : function(str){
+      str = str == null ? '' : String(str);
+      return str.charAt(0).toUpperCase() + str.slice(1);
+    },
+
+    chop: function(str, step){
+      if (str == null) return [];
+      str = String(str);
+      step = ~~step;
+      return step > 0 ? str.match(new RegExp('.{1,' + step + '}', 'g')) : [str];
+    },
+
+    clean: function(str){
+      return _s.strip(str).replace(/\s+/g, ' ');
+    },
+
+    count: function(str, substr){
+      if (str == null || substr == null) return 0;
+
+      str = String(str);
+      substr = String(substr);
+
+      var count = 0,
+        pos = 0,
+        length = substr.length;
+
+      while (true) {
+        pos = str.indexOf(substr, pos);
+        if (pos === -1) break;
+        count++;
+        pos += length;
+      }
+
+      return count;
+    },
+
+    chars: function(str) {
+      if (str == null) return [];
+      return String(str).split('');
+    },
+
+    swapCase: function(str) {
+      if (str == null) return '';
+      return String(str).replace(/\S/g, function(c){
+        return c === c.toUpperCase() ? c.toLowerCase() : c.toUpperCase();
+      });
+    },
+
+    escapeHTML: function(str) {
+      if (str == null) return '';
+      return String(str).replace(/[&<>"']/g, function(m){ return '&' + reversedEscapeChars[m] + ';'; });
+    },
+
+    unescapeHTML: function(str) {
+      if (str == null) return '';
+      return String(str).replace(/\&([^;]+);/g, function(entity, entityCode){
+        var match;
+
+        if (entityCode in escapeChars) {
+          return escapeChars[entityCode];
+        } else if (match = entityCode.match(/^#x([\da-fA-F]+)$/)) {
+          return String.fromCharCode(parseInt(match[1], 16));
+        } else if (match = entityCode.match(/^#(\d+)$/)) {
+          return String.fromCharCode(~~match[1]);
+        } else {
+          return entity;
+        }
+      });
+    },
+
+    escapeRegExp: function(str){
+      if (str == null) return '';
+      return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
+    },
+
+    splice: function(str, i, howmany, substr){
+      var arr = _s.chars(str);
+      arr.splice(~~i, ~~howmany, substr);
+      return arr.join('');
+    },
+
+    insert: function(str, i, substr){
+      return _s.splice(str, i, 0, substr);
+    },
+
+    include: function(str, needle){
+      if (needle === '') return true;
+      if (str == null) return false;
+      return String(str).indexOf(needle) !== -1;
+    },
+
+    join: function() {
+      var args = slice.call(arguments),
+        separator = args.shift();
+
+      if (separator == null) separator = '';
+
+      return args.join(separator);
+    },
+
+    lines: function(str) {
+      if (str == null) return [];
+      return String(str).split("\n");
+    },
+
+    reverse: function(str){
+      return _s.chars(str).reverse().join('');
+    },
+
+    startsWith: function(str, starts){
+      if (starts === '') return true;
+      if (str == null || starts == null) return false;
+      str = String(str); starts = String(starts);
+      return str.length >= starts.length && str.slice(0, starts.length) === starts;
+    },
+
+    endsWith: function(str, ends){
+      if (ends === '') return true;
+      if (str == null || ends == null) return false;
+      str = String(str); ends = String(ends);
+      return str.length >= ends.length && str.slice(str.length - ends.length) === ends;
+    },
+
+    succ: function(str){
+      if (str == null) return '';
+      str = String(str);
+      return str.slice(0, -1) + String.fromCharCode(str.charCodeAt(str.length-1) + 1);
+    },
+
+    titleize: function(str){
+      if (str == null) return '';
+      str  = String(str).toLowerCase();
+      return str.replace(/(?:^|\s|-)\S/g, function(c){ return c.toUpperCase(); });
+    },
+
+    camelize: function(str){
+      return _s.trim(str).replace(/[-_\s]+(.)?/g, function(match, c){ return c ? c.toUpperCase() : ""; });
+    },
+
+    underscored: function(str){
+      return _s.trim(str).replace(/([a-z\d])([A-Z]+)/g, '$1_$2').replace(/[-\s]+/g, '_').toLowerCase();
+    },
+
+    dasherize: function(str){
+      return _s.trim(str).replace(/([A-Z])/g, '-$1').replace(/[-_\s]+/g, '-').toLowerCase();
+    },
+
+    classify: function(str){
+      return _s.titleize(String(str).replace(/[\W_]/g, ' ')).replace(/\s/g, '');
+    },
+
+    humanize: function(str){
+      return _s.capitalize(_s.underscored(str).replace(/_id$/,'').replace(/_/g, ' '));
+    },
+
+    trim: function(str, characters){
+      if (str == null) return '';
+      if (!characters && nativeTrim) return nativeTrim.call(str);
+      characters = defaultToWhiteSpace(characters);
+      return String(str).replace(new RegExp('\^' + characters + '+|' + characters + '+$', 'g'), '');
+    },
+
+    ltrim: function(str, characters){
+      if (str == null) return '';
+      if (!characters && nativeTrimLeft) return nativeTrimLeft.call(str);
+      characters = defaultToWhiteSpace(characters);
+      return String(str).replace(new RegExp('^' + characters + '+'), '');
+    },
+
+    rtrim: function(str, characters){
+      if (str == null) return '';
+      if (!characters && nativeTrimRight) return nativeTrimRight.call(str);
+      characters = defaultToWhiteSpace(characters);
+      return String(str).replace(new RegExp(characters + '+$'), '');
+    },
+
+    truncate: function(str, length, truncateStr){
+      if (str == null) return '';
+      str = String(str); truncateStr = truncateStr || '...';
+      length = ~~length;
+      return str.length > length ? str.slice(0, length) + truncateStr : str;
+    },
+
+    /**
+     * _s.prune: a more elegant version of truncate
+     * prune extra chars, never leaving a half-chopped word.
+     * @author github.com/rwz
+     */
+    prune: function(str, length, pruneStr){
+      if (str == null) return '';
+
+      str = String(str); length = ~~length;
+      pruneStr = pruneStr != null ? String(pruneStr) : '...';
+
+      if (str.length <= length) return str;
+
+      var tmpl = function(c){ return c.toUpperCase() !== c.toLowerCase() ? 'A' : ' '; },
+        template = str.slice(0, length+1).replace(/.(?=\W*\w*$)/g, tmpl); // 'Hello, world' -> 'HellAA AAAAA'
+
+      if (template.slice(template.length-2).match(/\w\w/))
+        template = template.replace(/\s*\S+$/, '');
+      else
+        template = _s.rtrim(template.slice(0, template.length-1));
+
+      return (template+pruneStr).length > str.length ? str : str.slice(0, template.length)+pruneStr;
+    },
+
+    words: function(str, delimiter) {
+      if (_s.isBlank(str)) return [];
+      return _s.trim(str, delimiter).split(delimiter || /\s+/);
+    },
+
+    pad: function(str, length, padStr, type) {
+      str = str == null ? '' : String(str);
+      length = ~~length;
+
+      var padlen  = 0;
+
+      if (!padStr)
+        padStr = ' ';
+      else if (padStr.length > 1)
+        padStr = padStr.charAt(0);
+
+      switch(type) {
+        case 'right':
+          padlen = length - str.length;
+          return str + strRepeat(padStr, padlen);
+        case 'both':
+          padlen = length - str.length;
+          return strRepeat(padStr, Math.ceil(padlen/2)) + str
+                  + strRepeat(padStr, Math.floor(padlen/2));
+        default: // 'left'
+          padlen = length - str.length;
+          return strRepeat(padStr, padlen) + str;
+        }
+    },
+
+    lpad: function(str, length, padStr) {
+      return _s.pad(str, length, padStr);
+    },
+
+    rpad: function(str, length, padStr) {
+      return _s.pad(str, length, padStr, 'right');
+    },
+
+    lrpad: function(str, length, padStr) {
+      return _s.pad(str, length, padStr, 'both');
+    },
+
+    sprintf: sprintf,
+
+    vsprintf: function(fmt, argv){
+      argv.unshift(fmt);
+      return sprintf.apply(null, argv);
+    },
+
+    toNumber: function(str, decimals) {
+      if (!str) return 0;
+      str = _s.trim(str);
+      if (!str.match(/^-?\d+(?:\.\d+)?$/)) return NaN;
+      return parseNumber(parseNumber(str).toFixed(~~decimals));
+    },
+
+    numberFormat : function(number, dec, dsep, tsep) {
+      if (isNaN(number) || number == null) return '';
+
+      number = number.toFixed(~~dec);
+      tsep = typeof tsep == 'string' ? tsep : ',';
+
+      var parts = number.split('.'), fnums = parts[0],
+        decimals = parts[1] ? (dsep || '.') + parts[1] : '';
+
+      return fnums.replace(/(\d)(?=(?:\d{3})+$)/g, '$1' + tsep) + decimals;
+    },
+
+    strRight: function(str, sep){
+      if (str == null) return '';
+      str = String(str); sep = sep != null ? String(sep) : sep;
+      var pos = !sep ? -1 : str.indexOf(sep);
+      return ~pos ? str.slice(pos+sep.length, str.length) : str;
+    },
+
+    strRightBack: function(str, sep){
+      if (str == null) return '';
+      str = String(str); sep = sep != null ? String(sep) : sep;
+      var pos = !sep ? -1 : str.lastIndexOf(sep);
+      return ~pos ? str.slice(pos+sep.length, str.length) : str;
+    },
+
+    strLeft: function(str, sep){
+      if (str == null) return '';
+      str = String(str); sep = sep != null ? String(sep) : sep;
+      var pos = !sep ? -1 : str.indexOf(sep);
+      return ~pos ? str.slice(0, pos) : str;
+    },
+
+    strLeftBack: function(str, sep){
+      if (str == null) return '';
+      str += ''; sep = sep != null ? ''+sep : sep;
+      var pos = str.lastIndexOf(sep);
+      return ~pos ? str.slice(0, pos) : str;
+    },
+
+    toSentence: function(array, separator, lastSeparator, serial) {
+      separator = separator || ', ';
+      lastSeparator = lastSeparator || ' and ';
+      var a = array.slice(), lastMember = a.pop();
+
+      if (array.length > 2 && serial) lastSeparator = _s.rtrim(separator) + lastSeparator;
+
+      return a.length ? a.join(separator) + lastSeparator + lastMember : lastMember;
+    },
+
+    toSentenceSerial: function() {
+      var args = slice.call(arguments);
+      args[3] = true;
+      return _s.toSentence.apply(_s, args);
+    },
+
+    slugify: function(str) {
+      if (str == null) return '';
+
+      var from  = "ąàáäâãåæăćęèéëêìíïîłńòóöôõøśșțùúüûñçżź",
+          to    = "aaaaaaaaaceeeeeiiiilnoooooosstuuuunczz",
+          regex = new RegExp(defaultToWhiteSpace(from), 'g');
+
+      str = String(str).toLowerCase().replace(regex, function(c){
+        var index = from.indexOf(c);
+        return to.charAt(index) || '-';
+      });
+
+      return _s.dasherize(str.replace(/[^\w\s-]/g, ''));
+    },
+
+    surround: function(str, wrapper) {
+      return [wrapper, str, wrapper].join('');
+    },
+
+    quote: function(str, quoteChar) {
+      return _s.surround(str, quoteChar || '"');
+    },
+
+    unquote: function(str, quoteChar) {
+      quoteChar = quoteChar || '"';
+      if (str[0] === quoteChar && str[str.length-1] === quoteChar)
+        return str.slice(1,str.length-1);
+      else return str;
+    },
+
+    exports: function() {
+      var result = {};
+
+      for (var prop in this) {
+        if (!this.hasOwnProperty(prop) || prop.match(/^(?:include|contains|reverse)$/)) continue;
+        result[prop] = this[prop];
+      }
+
+      return result;
+    },
+
+    repeat: function(str, qty, separator){
+      if (str == null) return '';
+
+      qty = ~~qty;
+
+      // using faster implementation if separator is not needed;
+      if (separator == null) return strRepeat(String(str), qty);
+
+      // this one is about 300x slower in Google Chrome
+      for (var repeat = []; qty > 0; repeat[--qty] = str) {}
+      return repeat.join(separator);
+    },
+
+    naturalCmp: function(str1, str2){
+      if (str1 == str2) return 0;
+      if (!str1) return -1;
+      if (!str2) return 1;
+
+      var cmpRegex = /(\.\d+)|(\d+)|(\D+)/g,
+        tokens1 = String(str1).toLowerCase().match(cmpRegex),
+        tokens2 = String(str2).toLowerCase().match(cmpRegex),
+        count = Math.min(tokens1.length, tokens2.length);
+
+      for(var i = 0; i < count; i++) {
+        var a = tokens1[i], b = tokens2[i];
+
+        if (a !== b){
+          var num1 = parseInt(a, 10);
+          if (!isNaN(num1)){
+            var num2 = parseInt(b, 10);
+            if (!isNaN(num2) && num1 - num2)
+              return num1 - num2;
+          }
+          return a < b ? -1 : 1;
+        }
+      }
+
+      if (tokens1.length === tokens2.length)
+        return tokens1.length - tokens2.length;
+
+      return str1 < str2 ? -1 : 1;
+    },
+
+    levenshtein: function(str1, str2) {
+      if (str1 == null && str2 == null) return 0;
+      if (str1 == null) return String(str2).length;
+      if (str2 == null) return String(str1).length;
+
+      str1 = String(str1); str2 = String(str2);
+
+      var current = [], prev, value;
+
+      for (var i = 0; i <= str2.length; i++)
+        for (var j = 0; j <= str1.length; j++) {
+          if (i && j)
+            if (str1.charAt(j - 1) === str2.charAt(i - 1))
+              value = prev;
+            else
+              value = Math.min(current[j], current[j - 1], prev) + 1;
+          else
+            value = i + j;
+
+          prev = current[j];
+          current[j] = value;
+        }
+
+      return current.pop();
+    },
+
+    toBoolean: function(str, trueValues, falseValues) {
+      if (typeof str === "number") str = "" + str;
+      if (typeof str !== "string") return !!str;
+      str = _s.trim(str);
+      if (boolMatch(str, trueValues || ["true", "1"])) return true;
+      if (boolMatch(str, falseValues || ["false", "0"])) return false;
+    }
+  };
+
+  // Aliases
+
+  _s.strip    = _s.trim;
+  _s.lstrip   = _s.ltrim;
+  _s.rstrip   = _s.rtrim;
+  _s.center   = _s.lrpad;
+  _s.rjust    = _s.lpad;
+  _s.ljust    = _s.rpad;
+  _s.contains = _s.include;
+  _s.q        = _s.quote;
+  _s.toBool   = _s.toBoolean;
+
+  // Exporting
+
+  // CommonJS module is defined
+  if (typeof exports !== 'undefined') {
+    if (typeof module !== 'undefined' && module.exports)
+      module.exports = _s;
+
+    exports._s = _s;
+  }
+
+  // Register as a named module with AMD.
+  if (typeof define === 'function' && define.amd)
+    define('underscore.string', [], function(){ return _s; });
+
+
+  // Integrate with Underscore.js if defined
+  // or create our own underscore object.
+  root._ = root._ || {};
+  root._.string = root._.str = _s;
+}(this, String);