bugfix/web_encoding: fix web specific encoding issue

[Mooyeee]

This PR solves an encoding issue encountered on web where some special accented characters (i.e. èéàùìò) would translate to \uFFFD (�) which would make the app crash when trying to log it to the web console.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d8d68ca) to head (c1f8d42).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master      #348      +/-   ##
===========================================
+ Coverage   98.45%   100.00%   +1.54%     
===========================================
  Files          28         8      -20     
  Lines         583        66     -517     
===========================================
- Hits          574        66     -508     
+ Misses          9         0       -9     

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Files not reviewed (1)

• packages/talker_logger/lib/src/logger_web.dart: Language not supported