What is i18n?
i18n is Unbound’s localization layer. It loads string tables for the user’s active Discord locale, falls back to en-US, and gives you a Messages proxy and a format function to render those strings, so your addon speaks the user’s language without you wiring up locale detection yourself.
The Messages proxy
Messages is a proxy over the loaded string tables. Read a key off it and it resolves through three layers in order: the active locale, then en-US, then the key itself (so a missing translation degrades to something readable instead of undefined).
When a string has placeholders, use format. It resolves the key through Messages, then interpolates your variables using ICU MessageFormat, so plurals, selects, and named slots all work.
Addon localizations
Your addon ships its own strings, and defineLocalizations gives it an isolated Messages/format pair over a table you provide. It shares the active locale with core, so your strings switch languages in lockstep with Discord, but your keys stay your own.
Always include an en-US table. It’s the fallback every other locale resolves to when a key is missing.
