Merge pull request #78 from henriquecf/61-translate-fields-and-messages

61 translate fields and messages
Made CreatorRestriction inheritate from Common and closed #76
Merge pull request #80 from henriquecf/76-creator-restriction-inheritance-from-common

Made CreatorRestriction inheritate from Common and closed #76
Renamed settings files and closed #79
Merge pull request #81 from henriquecf/79-rename-settings-files

Renamed settings files and closed #79
Merged master
Merged master
Renamed classes in files related with creator field to author