many i18n fixes for pages and database
other i18n and proposal_histories specific page for search engines
Update version.rb
Update en.yml
Merge pull request #1 from mion00/patch-2

Update en.yml
something about roadmap
roadmap and ical format
some css fixing and bug fixing
Merge branch 'version_2_1' of github.com:coorasse/Airesis into version_2_1
private_pub and icalendar
security fix, read all button, notifications
qf
Fixed typo
Google Form

new Google form for the volunteers
proposal models
fix for authenticity token
fixed some permessions to destroy proposals
try another way to send a newsletter
i18n fixes
Merge branch 'patch-1' of https://github.com/mion00/Airesis into version_2_1