Add convenience function MustLocalizeMessage

[apricotbucket28]

Added a must variant of LocalizeMessage (like Localize & MustLocalize)

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.02%. Comparing base (89ed3ee) to head (022ce4e).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
i18n/localizer.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #352      +/-   ##
==========================================
+ Coverage   74.96%   75.02%   +0.06%     
==========================================
  Files          20       20              
  Lines        2061     2066       +5     
==========================================
+ Hits         1545     1550       +5     
+ Misses        454      453       -1     
- Partials       62       63       +1     

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