Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-cfs-upload-http/tests/client-tests.js

@@ -0,0 +1,27 @@
+function equals(a, b) {
+  return !!(EJSON.stringify(a) === EJSON.stringify(b));
+}
+
+Tinytest.add('cfs-upload-http - client - test environment', function(test) {
+  test.isTrue(typeof FS.Collection !== 'undefined', 'test environment not initialized FS.Collection');
+});
+
+//Test API:
+//test.isFalse(v, msg)
+//test.isTrue(v, msg)
+//test.equalactual, expected, message, not
+//test.length(obj, len)
+//test.include(s, v)
+//test.isNaN(v, msg)
+//test.isUndefined(v, msg)
+//test.isNotNull
+//test.isNull
+//test.throws(func)
+//test.instanceOf(obj, klass)
+//test.notEqual(actual, expected, message)
+//test.runId()
+//test.exception(exception)
+//test.expect_fail()
+//test.ok(doc)
+//test.fail(doc)
+//test.equal(a, b, msg)