Added missing Sinhalese translations

[truekasun]

🌐 Added missing translations

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🤖 Generated by Copilot at 1c21e96

Added a Sinhala translation for the email confirmation message. This change affects the file ghost/i18n/locales/si/ghost.json and improves the localization for Sinhala users.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (d9480f9) 71.68% compared to head (1c21e96) 71.70%.

❗ Current head 1c21e96 differs from pull request most recent head d85d030. Consider uploading reports for the commit d85d030 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17172      +/-   ##
==========================================
+ Coverage   71.68%   71.70%   +0.02%     
==========================================
  Files        1836     1833       -3     
  Lines      116454   116269     -185     
  Branches    17272    17280       +8     
==========================================
- Hits        83479    83370     -109     
+ Misses      31853    31777      -76     
  Partials     1122     1122              

Flag	Coverage Δ
e2e-tests	66.54% <ø> (+0.09%)	⬆️
unit-tests	63.54% <ø> (-0.07%)	⬇️

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see 18 files with indirect coverage changes

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