updates German translation

Since 'Job' was renamed to 'Item', this translation should be updated
Update sidepanel_de.properties
Update newJob_de.properties
[FIX JENKINS-23041] Fix systemInfo for offline slaves

- Don't show link in sidebar
- Make systemInfo page more robust when accessed via URL
[FIX JENKINS-18048] Fix link of SCMTriggerCause from UpstreamCause

- UpstreamCause now tries to initialize upstream causes with the
  correct build in onLoad
- SCMTriggerCause stores build reference and uses its URL to build
  absolute link to changelog
[FIX JENKINS-14538] Improve builds dir input validation
[JENKINS-14583] Move replacement into shared function for reuse
[FIXED JENKINS-17667] - Syncronization of InstallerTranslator::getToolHome()

There appears to be some unthreadsafe initialization going on here.
Initialize/get inside a synchronized block for threadsaftey.
Fix changelog generation in ExtractResourceWithChangesSCM
when several files are changed at once
(used in the fix for JENKINS-22622)
Update newJob_de.properties
[FIXED SECURITY-133] Restrict access to SCMTrigger status page

The page shows the names and URLs of all jobs currently busy with
polling. This includes jobs users might not regularly be able to
access and might therefore reveal otherwise hidden information.
[FIXED JENKINS-18902] Exclude lower bound of range from changes
Merge branch 'master' into JENKINS-18048

Conflicts:
	core/src/main/java/hudson/triggers/SCMTrigger.java
[FIX JENKINS-22971] Show full project name when in folder.
[JENKINS-14583] Fix tests
[FIXED JENKINS-23636] Indicate node the job workspace is on
Break links inside pre tags

to prevent page from horizontal scrolling.
Update style.css
Switch underline/non underline on sidebar

The underline adds slightly too much visual weight to the links in question.
This changes the links to not have an underline by default, while still adding
the underline when the link is hovered.

Normally accessibility requirements demand that you add an underline for all
clickable text. However, in this case the positioning of the elements, their
changed color, the presence of an icon next to the links, and the link hover
effect combine to give these elements the appearance of clickability.
Merge pull request #1314 from kevinburke/lighter

Switch underline/non underline on sidebar