v0.7.2.1j

• Fixed checksum for firmware 7.20
• Updated italian translation
• Version in main caption
• Fixed checksum when trailing 0 is missing

Release for firmware 7.20

With version 7.20 checksum doesn't work because this version introduces a new binary file type: base64 encoded.
I implemented this to correctly recognize and include in the checksum this chunk of the main file.