locale FF fix, empty cell another symbol

Author: nikitaeverywhere

source/js/PivotLocale.js

@@ -11,7 +11,7 @@ var PivotLocale = function (locale) {
     this.DEFAULT_LOCALE = "en";
 
     this.setLocale(locale
-                   || navigator.language
+                   || (navigator.language || "").substr(0, 2)
                    || (navigator["browserLanguage"]
                    || this.DEFAULT_LOCALE).substring(0, 2));
 

source/js/PivotView.js

@@ -853,7 +853,7 @@ PivotView.prototype.renderRawData = function (data) {
                     //div2 = document.createElement("div");
                     if (rawData[y][x].value) {
                         div.textContent = rawData[y][x].value;
-                    } else div.innerHTML = "‌";
+                    } else div.innerHTML = " ";
                     //div2.appendChild(div);
                     th.appendChild(div);
                     if (rawData[y][x].style) th.setAttribute("style", rawData[y][x].style);