Add support of Fon language (no supported in libicu)

[kelson42]

Fixes #1002

See

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.92%. Comparing base (e8b8c18) to head (733b027).
Report is 211 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1013   +/-   ##
=======================================
  Coverage   38.92%   38.92%           
=======================================
  Files          58       58           
  Lines        3990     3990           
  Branches     2201     2201           
=======================================
  Hits         1553     1553           
  Misses       1090     1090           
  Partials     1347     1347           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.