Various translation fixes
[maven-release-plugin] prepare release jenkins-1.546
[maven-release-plugin] prepare for next development iteration
updated changelog for release
Merge pull request #1083 from bkmeneguello/portuguese-translation

Various translation fixes
[FIXED JENKINS-21239] Trend Graph NPE when no builds
Changelog record for PR #1084
updated changelog as a part of the release
merged back the RC branch
creating an RC branch
the trunk is toward 1.548-SNAPSHOT
Fixing some POM warnings.
[FIXED JENKINS-21254] Ensuring that all <link>s offered on the /login page can be read even by anonymous users without Jenkins.READ.
[FIXED JENKINS-19826] element.setAttribute('name', …) does not work in IE in compatibility mode, so use prototype’s Element(…) which does.