css
Merge remote-tracking branch 'amir/master'
Merge remote-tracking branch 'yaniv/master'
Added previous guests to participants form.

Some translations.
Some css.
Added is_member to Community mixin.
Merge remote-tracking branch 'yaniv/master'

Conflicts:
	src/ocd/locale/he/LC_MESSAGES/django.mo
	src/ocd/locale/he/LC_MESSAGES/django.po
fix 'add guest from previous list' action
check permission for post 'ranking vote'