[fix bug 1016914] Show error messages when casting a vote.
Merge pull request #756 from akatsoulas/voting-fixes

Show error messages when casting a vote.
[fix bug 1016912] Extend vote by 24 hours if voting ends tomorrow and low turnout.
Merge pull request #757 from glogiotatidis/extend-fix

Extend vote by 24 hours if voting ends tomorrow and low turnout.