Clarify VoiceOver actions, details in commit message

Contacts Modal button -- Added accessibility label
Polling Location Cell -- Set label to type of vote site
                         Value set to text of the cell
Stop Directions Bar Button -- Switched to Done button,
                              is more representative of action
Share Directions Bar Button -- Added accessibility label/hint
Party Picker Button -- Added accessibility hint
Election Picker Button -- Added accessibility hint
Update localized strings
Merge pull request #119 from CloudNiner/feature/voiceover

Clarify VoiceOver Actions