WordPress share activity uses correct modal presentation style.

Show share activity via a popover on WPWebViewController on iPad.
Merge pull request #2156 from wordpress-mobile/issues/2153-share-activity-fix

WordPress share activity uses correct modal presentation style.
Updating localized strings.
Merge branch 'release/4.2' of github.com:wordpress-mobile/WordPress-iOS into feature/editor-update

# By Sendhil Panchadsaram (1) and aerych (1)
# Via Sendhil Panchadsaram
* 'release/4.2' of github.com:wordpress-mobile/WordPress-iOS:
  Updating localized strings.
  WordPress share activity uses correct modal presentation style.
Pod updates.
Fix for strange keyboard animation in editor.