Fixing JENKINS-22750, regression introduced in JENKINS-21394
Fixed test and refined behaviour
[FIX JENKINS-22867] Fix localization and relative links.
[FIX JENKINS-22028] Allow MarkupFormatter without enabling security

Given the current default of 'Escaped HTML', it makes no sense
to require users to 'Enable Security' to set up a less secure
alternative. So show it on the global security configuration page
on top level.
Use proper array lenght

See PR #1233 and discussion therein.
Merge branch 'JENKINS-22028' of github.com:daniel-beck/jenkins
[JENKINS-22028] Noting merge of #1235.
Merge branch 'JENKINS-22867' of github.com:daniel-beck/jenkins
[JENKINS-22867] Noting merge of #1232.
the trunk is toward 1.565-SNAPSHOT
Merge branch 'master' of github.com:jenkinsci/jenkins
Follow-up on JENKINS-22867

Added missing target attributes to links and fixed some apostrophes.
Also incorporated jglick's suggestions on quoting with '{'.
[FIXED JENKINS-22982] Copy-Paste Errors in German Translation Resource
for LogRotator
Added nullability annotations to getComputer.
[FIXED JENKINS-22938] SSH slave connections die after the slave outputs 4MB of stderr, usually during findbugs analysis
Adding some nullness annotations related to Job.getEnvironment.
Cf.: https://github.com/jenkinsci/subversion-plugin/pull/83
Use logging API correctly and introduce the ability to differentiate between the logging level for task execution taking too long
Merge pull request #1215 from MadsNielsen/JENKINS-21394-Regression

Fixing JENKINS-22750, regression introduced in JENKINS-21394
Noting #1215
[FIXED JENKINS-23070]

Testing the bot