Kill Slice naming convention...

[hughhhh]

Missed some references of slices using this PR as a cleanup.

[codecov-io]

Codecov Report

Merging #4641 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #4641   +/-   ##
=======================================
  Coverage   71.22%   71.22%           
=======================================
  Files         190      190           
  Lines       14880    14880           
  Branches     1098     1098           
=======================================
  Hits        10598    10598           
  Misses       4279     4279           
  Partials        3        3

Impacted Files	Coverage Δ
...ssets/javascripts/explore/components/SaveModal.jsx	93.75% <ø> (ø)	⬆️
...ascripts/explore/components/ExploreChartHeader.jsx	71.42% <0%> (ø)	⬆️

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[vylc]

Found a few more--new issue or add on here?
(1) Copy Dashboard - go to any dashboard, under Actions, choose Save, dialog box asks to copy slices
(2) Edit table - Details/Summary tab, Associated charts section instructions has slice references everywhere
(3) Edit chart - In the Details/Summary tab, cache timeout references slice