Translations setup + es

[cbrinicombe13]

Changes:

• Moves file structure to localised setup
• Shares core files among languages
• Uses Lingo.dev as translation engine
• Adds scripts for PIT locale generation
• Adds scripts to manage brand voice and glossary terms + instructions on using Lingo MCP server to sync with engine

Specific points that required attention:

• Migrating all image/video src attributes to look one level higher for shared assets
• Use shared openapi.yml across locales - API and webhook titles are assumed from this, written directly into the en files and then translated into other locales.
• Internal links are rewritten to the locale-specific paths (however anchors '#...' are kept in tact in en for consistent internal and external navigation

TODO:

• CI translation scripts
• CI checks to suggest likely glossary updates we should make
• Lingo AI reviewer - script to run locally and automated checks on CI
• Translate openapi.yml file

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