New version for Huawei 257 (3.49H) released

What's new:

• The application now has a website (https://www.multinotes.app) with a complete "User Guide" covering all of the application's features.
  To open the User Guide, click the question mark (?) button at the bottom of the board.
  You can open the website in Settings, under Services.

• Minor changes to the interface and some bugs fixed.