Don't make button text all-caps

[imnasnainaec]

Resolves #3069

(User Guide screen shots that show all-caps buttons can stick around until they need to be replaced for other reasons.)

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.63%. Comparing base (25c5298) to head (06f6e2f).
Report is 31 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3231      +/-   ##
==========================================
+ Coverage   66.53%   74.63%   +8.10%     
==========================================
  Files         232      279      +47     
  Lines        5704    10697    +4993     
  Branches      689     1289     +600     
==========================================
+ Hits         3795     7984    +4189     
- Misses       1691     2351     +660     
- Partials      218      362     +144     

Flag	Coverage Δ
backend	83.89% <ø> (?)
frontend	66.53% <ø> (ø)

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[jasonleenaylor]

Reviewed 11 of 11 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

[jasonleenaylor]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)