react files polish cleanup

closes: CNVS-12727

clean up ItemCog code
better handling of kylemenu popup
I18n'ed some stuff

Change-Id: I0c5401e4f24288e3ba8a724e319774cce2cb7571
Reviewed-on: https://gerrit.instructure.com/40049
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>