Skip grenade job on doc/translation updates

Import a few more irrelevant files from base grenade job definition
to avoid triggering grenade jobs on non-functional update.

Change-Id: I254e175070660b7361ee8de149acf906331d608f

.zuul.yaml

@@ -15,6 +15,11 @@
     parent: grenade-multinode
     voting: false
     irrelevant-files:
+      - ^.*\.rst$
+      - ^doc/.*$
+      - ^releasenotes/.*$
+      - ^.git.*$
+      - ^.*/locale/.*po$
       - ^(test-|)requirements.txt$
       - ^setup.cfg$
       - ^\.pre-commit-config\.yaml$