Build and update script for translations

[jonodeno]

Adds a script with build and update sub-commands

Fixes #18.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 135 lines in your changes missing coverage. Please review.

Project coverage is 82.64%. Comparing base (886f15e) to head (6b3df3f). Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
i18n-helpers/src/bin/mdbook-translate-helper.rs	0.00%	135 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
- Coverage   84.74%   82.64%   -2.11%     
==========================================
  Files          15       18       +3     
  Lines        3377     3809     +432     
  Branches     3377     3809     +432     
==========================================
+ Hits         2862     3148     +286     
- Misses        413      558     +145     
- Partials      102      103       +1     

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