Backend Polling Stations

[paarals]

In order to use the Polling Stations, I need:

• Voting space
• Type: Hybrid
• Create component: Elections
• Create election: Test election

Then, I need:

• Create Polling Officers (at least 2)
  
• Create Polling Station
  
• Bug 1: President and Choose polling officers are different formats
• Bug 2: Polling Officers added in the Polling Station are removed every time you edit the Polling Station