fixed a bug which caused issue search not to work when issue ranking is disabled
Merge branch 'release_sprint_5' into production
added a default value to proposalvote.value
Merge branch 'master' into production
Some modifications to participants form.

Some translation.
add support for multi line in invitations import
Show gray voting result tag when voted on all proposals (per user, per issue)
fix 'from email'
remove delay between sending invitation emails(import from file)
Merge remote-tracking branch 'yaniv/master'
bugfix: should not allow non-logged-in users in open communities to vote on issue ranking
even though they have similar permissions to registered users