[frontend] Fix left/right to work with rtl

[imnasnainaec]

Fixes #3604

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This change is 

[imnasnainaec]

Reviewable status: 0 of 30 files reviewed, 1 unresolved discussion (waiting on @imnasnainaec)

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src/goals/CharacterInventory/CharInv/CharacterList/CharacterCard.tsx line 33 at r1 (raw file):

          style={{
            height: props.fontHeight,
            marginLeft: theme.spacing(1),

This marginLeft is intentionally dropped (rather than replaced with marginInlineStart) because it puts the character off-center.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 73.25%. Comparing base (dbb3cf9) to head (7020a4f).
Report is 21 commits behind head on master.

Files with missing lines	Patch %	Lines
src/components/AppBar/SpeakerMenu.tsx	0.00%	0 Missing and 1 partial ⚠️
src/components/AppBar/UserMenu.tsx	50.00%	0 Missing and 1 partial ⚠️
src/components/Dialogs/DeleteEditTextDialog.tsx	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3671      +/-   ##
==========================================
- Coverage   73.26%   73.25%   -0.01%     
==========================================
  Files         285      285              
  Lines       10627    10631       +4     
  Branches     1321     1323       +2     
==========================================
+ Hits         7786     7788       +2     
  Misses       2451     2451              
- Partials      390      392       +2     

Flag	Coverage Δ
backend	82.81% <ø> (ø)
frontend	65.77% <40.00%> (-0.02%)	⬇️

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[jasonleenaylor]

Reviewed 29 of 30 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @imnasnainaec)