Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-request/tests/test-hawk.js

@@ -0,0 +1,41 @@
+try {
+  require('hawk')
+} catch (e) {
+  console.error('hawk must be installed to run this test.')
+  console.error('skipping this test. please install hawk and run again if you need to test this feature.')
+  process.exit(0)
+}
+
+var createServer = require('http').createServer
+  , request = require('../index')
+  , hawk = require('hawk')
+  , assert = require('assert')
+  ;
+
+var server = createServer(function (req, resp) {
+  
+  var getCred = function (id, callback) {
+    assert.equal(id, 'dh37fgj492je')
+    var credentials = 
+      { key: 'werxhqb98rpaxn39848xrunpaw3489ruxnpa98w4rxn'
+      , algorithm: 'sha256'
+      , user: 'Steve'
+      }
+    return callback(null, credentials)
+  }
+
+  hawk.server.authenticate(req, getCred, {}, function (err, credentials, attributes) {
+    resp.writeHead(!err ? 200 : 401, { 'Content-Type': 'text/plain' })
+    resp.end(!err ? 'Hello ' + credentials.user : 'Shoosh!')
+  })
+  
+})
+
+server.listen(8080, function () {
+  var creds = {key: 'werxhqb98rpaxn39848xrunpaw3489ruxnpa98w4rxn', algorithm: 'sha256', id:'dh37fgj492je'}
+  request('http://localhost:8080', {hawk:{credentials:creds}}, function (e, r, b) {
+    assert.equal(200, r.statusCode)
+    assert.equal(b, 'Hello Steve')
+    server.close()
+  })
+})