Update language files documentation.

[cmy82]

Added note to clear cache from bakery cli when updating language files for changes to be visible in app.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.23%. Comparing base (53ac1db) to head (8f8c8b8).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #156   +/-   ##
=========================================
  Coverage     92.23%   92.23%           
  Complexity      204      204           
=========================================
  Files            27       27           
  Lines           773      773           
=========================================
  Hits            713      713           
  Misses           60       60           

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[lcharette]

Thanks !