Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-cfs-storage-adapter/storageAdapter.client.js

@@ -0,0 +1,37 @@
+/* global FS, _storageAdapters:true, EventEmitter */
+
+// #############################################################################
+//
+// STORAGE ADAPTER
+//
+// #############################################################################
+
+_storageAdapters = {};
+
+FS.StorageAdapter = function(name, options, api) {
+  var self = this;
+
+  // Check the api
+  if (typeof api === 'undefined') {
+    throw new Error('FS.StorageAdapter please define an api');
+  }
+
+  // store reference for easy lookup by name
+  if (typeof _storageAdapters[name] !== 'undefined') {
+    throw new Error('Storage name already exists: "' + name + '"');
+  } else {
+    _storageAdapters[name] = self;
+  }
+
+  // extend self with options and other info
+  FS.Utility.extend(this, options || {}, {
+    name: name
+  });
+
+  // XXX: TODO, add upload feature here...
+  // we default to ddp upload but really let the SA like S3Cloud overwrite to
+  // implement direct client to s3 upload
+
+};
+
+FS.StorageAdapter.prototype = new EventEmitter();