changed relations to posts for volunteers
updated front page block to use new post relation
added some stuff for restricting users access to polling stations.
added valhalla settings
Merge branch 'feature/volunteers_posts_relation_update'
updated view for volunteers
updated term stuff for parties
updated vocab selection
update role label stuff on volunteer
fixed some php warnings
fixed more notices
updated add volunteer stuff
Fixed error on description for mail
Fix: Couldnt add volunteers to empty polling stations.