Added missing translations for Polish language

[JENKINS-32517] Deprecate Queue#getApproximateItemsQuickly

[FIXED JENKINS-24696] Cannot assume that Jenkins.getInstance() != null when we are running a boot failure script.
(cherry picked from commit 42de07bb)

(cherry picked from commit 09722a98)

(#1986 continuation)

updated changelog for JENKINS-32328

[JENKINS-26466] Decouple AbstractProject from DiskSpaceMonitor

Now that the item list is obtained lock-free the cache is no longer needed.
Besides, the cache could be returning invalid results for requests with different authorization to the one that cached the result (in any case this invalid result is transient).

 [FIXED JENKINS-32328] process multiple update-centers for ToolInstallers

As part of the process of getting a [new plugin parent POM](https://github.com/jenkinsci/plugin-pom) decouple from the core project
the plugin module is removed.

BuildTriggerTest.downstreamProjectShouldObserveCompletedParent failure

[FIX JENKINS-31753] Fields are aligned at the bottom

[JENKINS-26466] Decouple Node from NodeMonitor

Another fix for the future node_monitors package extraction.

This time, a simple import removal.

Downgrade “termination trace” warnings