feat: initial project prototype (#1)

### Explanation

_No response_

### Issue

_No response_

### 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>

test/locales.spec.ts

@@ -0,0 +1,22 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { describe, it, expect } from "vitest";
+import { supportedLocales, mappedLocales } from "../src/config/locales.js";
+
+const localesSupportedByLibretranslate = [ "ar", "az", "bg", "bn", "ca", "cs", "da", "de", "el", "en", "eo", "es", "et", "eu", "fa", "fi", "fr", "ga", "gl", "he", "hi", "hu", "id", "it", "ja", "ko", "lt", "lv", "ms", "nb", "nl", "pl", "pt", "ro", "ru", "sk", "sl", "sq", "sv", "th", "tl", "tr", "uk", "ur", "zh", "zt" ];
+
+describe("i18n locales", () => {
+  it.each(supportedLocales)("%s should be supported by libretranslate", (lang) => {
+    expect.assertions(1);
+    expect(localesSupportedByLibretranslate, `${lang} is not supported by libretranslate`).toContain(lang);
+  });
+
+  it.each(Object.values(mappedLocales))("%s should be mapped to a supported locale", (lang) => {
+    expect.assertions(1);
+    expect(supportedLocales, `${lang} is not supported by our app`).toContain(lang);
+  });
+});

test/responses.spec.ts

@@ -0,0 +1,48 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { describe, it, expect } from "vitest";
+import { supportedLocales } from "../src/config/locales.js";
+import { responses } from "../src/i18n/responses.js";
+
+describe("i18n responses", () => {
+  it.each(Object.keys(responses))(
+    "should have interpolated values for translation key in lang %s",
+    (lang) => {
+      expect.assertions(3);
+      expect(
+        responses[lang]?.translation,
+        "does not have translation variable",
+      ).toMatch(/{{translation}}/);
+      expect(
+        responses[lang]?.translation,
+        "does not have language variable",
+      ).toMatch(/{{language}}/);
+      expect(
+        responses[lang]?.translation,
+        "does not have confidence variable",
+      ).toMatch(/{{confidence}}/);
+    },
+  );
+
+  it.each(Object.keys(responses))(
+    "should have interpolated values for unsupported-locale key in lang %s",
+    (lang) => {
+      expect.assertions(1);
+      expect(
+        responses[lang]?.["unsupported-locale"],
+        "does not have target variable",
+      ).toMatch(/{{target}}/);
+    },
+  );
+
+  it.each(Object.keys(responses))(
+    "%s should be supported by our software", (lang) => {
+      expect.assertions(1);
+      expect(supportedLocales, `${lang} is not supported by our app`).toContain(lang);
+    },
+  );
+});