Enable bling warning indication for reviews, to warn user in some cases.

[nroggeman-ledger]

Description

The goal of this PR is to enable bling warning indication for reviews, to warn user in some cases.
A warning button is displayed on top-right of the first and last pages of the review, and when touched a modal warning text is displayed.
It can be activated by adding | BLIND OPERATION to operationType param of review.
It enables for example the modal screen presented in https://ledgerhq.atlassian.net/browse/B2CA-1667

Changes include

• Bugfix (non-breaking change that solves an issue)
• [*] New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.47%. Comparing base (4799a57) to head (aeb8718).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #674   +/-   ##
=======================================
  Coverage   60.47%   60.47%           
=======================================
  Files          12       12           
  Lines        1723     1723           
=======================================
  Hits         1042     1042           
  Misses        681      681           

Flag	Coverage Δ
unittests	60.47% <ø> (ø)

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