Handle correctly ignored file in multilanguages book

lib/models/book.js

@@ -121,6 +121,14 @@ Book.prototype.getContentRoot = function() {
 */
 Book.prototype.isFileIgnored = function(filename) {
     var ignore = this.getIgnore();
+    var language = this.getLanguage();
+
+    // Ignore is always relative to the root of the main book
+    if (language) {
+        filename = path.join(language, filename);
+    }
+
+
     return ignore.filter([filename]).length == 0;
 };
 
@@ -217,6 +225,7 @@ Book.createForFS = function createForFS(fs) {
 Book.createFromParent = function createFromParent(parent, language) {
     return new Book({
         logger: parent.getLogger(),
+        ignore: parent.getIgnore(),
         language: language,
         fs: FS.reduceScope(parent.getFS(), language)
     });