Referendum question should be moved to the `subtitle` field.

[dapetcu21]

Using the ballot field for referendum questions causes some pretty bad UX, as it wasn't designed for very long text. In the original design, the referendum question was to be plugged into subtitle and the UI is adjusted for that.

Proposed changes:

• some shorthand should be used for ballot, like "Întrebare 1"/"Întrebare 2" or "Interzicerea OUG despre justiție"
• The full question text should be moved to subtitle
• Validat/Invalidat should be moved to a separate field in meta (maybe a boolean or an enum?).
• The page header should be changed to either display both ballot and subtitle in different font sizes, either only display subtitle and hide ballot when subtitle is present.

Examples of how it looks bad: