During serialization don't convert unicode to ASCII

[lprichar]

Issue

Fixes #791

Description

During serialization unicode like Raúl will no longer be encoded as Ra\u00fal and will instead just be encoded as Raúl.

Testing

1. Modify a manifest to put unicode in a candidate's name.
2. Create an election in the GUI
3. Export an encryption package

Expected: the candidate's name should contain unicode