Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-cfs-filesystem/filesystem.client.js

@@ -0,0 +1,10 @@
+// On the client we have just a shell
+FS.Store.FileSystem = function(name, options) {
+  var self = this;
+  if (!(self instanceof FS.Store.FileSystem))
+    throw new Error('FS.Store.FileSystem missing keyword "new"');
+
+  return new FS.StorageAdapter(name, options, {
+    typeName: 'storage.filesystem'
+  });
+};