OmniGears: translation to PT-BR

Merged my job with some strings from Raphael Schwinden da Silveira (http://jira.omnirom.org/browse/OMNI-302?jql=project%20%3D%20OMNI)

Change-Id: Ibcae1a25e39452c0e75d0898e2a21772fa9960dd
merge changes from Omni 4.4 into local branch