✅(i18n) install jest and add tests

We install Jest to test our i18n package.
We tests:
  - the extraction of the translations on the Desk app fo crowdin
  - the formatings of the translations from crowdin to the app
  - we check that all the translations are present in the app
We connect the tests to the CI.

src/frontend/packages/i18n/package.json

@@ -6,10 +6,16 @@
     "extract-translation": "yarn extract-translation:desk",
     "extract-translation:desk": "yarn i18next ../../apps/desk/**/*.{ts,tsx} -c ./i18next-parser.config.mjs -o ./locales/desk/translations-crowdin.json",
     "format-deploy": "yarn format-deploy:desk",
-    "format-deploy:desk": "node ./format-deploy.mjs --app=desk --output=../../apps/desk/src/i18n/translations.json"
+    "format-deploy:desk": "node ./format-deploy.mjs --app=desk --output=../../apps/desk/src/i18n/translations.json",
+    "test": "jest"
   },
   "dependencies": {
+    "@types/jest": "29.5.11",
+    "@types/node": "20.11.6",
     "i18next-parser": "8.8.0",
+    "jest": "29.7.0",
+    "ts-jest": "29.1.2",
+    "typescript": "*",
     "yargs": "17.7.2"
   }
 }