MLPAB-1484 Escape data passed to templated translation messages

[hawx]

https://github.com/nicksnyder/go-i18n/blob/main/v2/internal/template.go#L7 is the line that we'd need to change, but given we don't actually use much of the package I thought it might be easier writing this. It also opens up a bit more flexibility, e.g. if we wanted to simplify Welsh plural forms in the future.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (17e40a0) 91.68% compared to head (5c191b6) 91.78%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
cmd/event-received/cloud_watch_event_handler.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #964      +/-   ##
==========================================
+ Coverage   91.68%   91.78%   +0.09%     
==========================================
  Files         170      172       +2     
  Lines        9484     9599     +115     
==========================================
+ Hits         8695     8810     +115     
  Misses        674      674              
  Partials      115      115              

Flag	Coverage Δ
unittests	91.78% <99.29%> (+0.09%)	⬆️

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[github-actions]

PR Environment Terraform Plan Summary

Plan: 1 to add, 4 to change, 1 to destroy

[acsauk]

Nice job, hopefully we can look at how often (if ever) our translations fall into the 4 variations of pluralisms for Welsh and slim that down if it turns out they're the same everywhere.