feat: initial project prototype (#1)

### Explanation

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### Issue

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### Attestations

- [x] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [x] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [x] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [x] I have pinned the dependencies to a specific patch version.

### Style

- [x] I have run the linter and resolved any errors.
- [x] My pull request uses an appropriate title, matching the conventional commit standards.
- [x] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

### Documentation

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### Versioning

Major - My pull request introduces a breaking change.

Reviewed-on: #1
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/utils/i18n.ts

@@ -0,0 +1,28 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { responses } from "../i18n/responses.js";
+
+/**
+ * Translates a key to the specified locale, performing
+ * interpolation on the string.
+ * @param key -- The key to translate.
+ * @param locale -- The user's locale.
+ * @param interpolation -- An object of keys to replace with values.
+ * @returns The translated string.
+ */
+export const i18n = (
+  key: keyof (typeof responses)["en"],
+  locale: string,
+  interpolation: Record<string, unknown> = {},
+): string => {
+  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- We know the en key exists, but having the loose type helps.
+  const string = responses[locale]?.[key] ?? responses.en![key];
+  // eslint-disable-next-line unicorn/no-array-reduce -- This is the cleanest way to do it, really.
+  return Object.entries(interpolation).reduce((accumulator, [ k, v ]) => {
+    return accumulator.replace(`{{${k}}}`, String(v));
+  }, string);
+};