feat: localization (#196)

* Started adding locale translations :)

* Added some more translations

* Working on translating even more pages

* More translations

* Added test default locale retrieval

* replace `intl.formatMessage` with custom `t` hook

* add more translations

* improve title syntax

* add more translations

* translate admin config page

* translated error messages

* add language selecter

* minor fixes

* improve language handling

* add upcoming languages

* add `crowdin.yml`

* run formatter

---------

Co-authored-by: Steve Tautonico <stautonico@gmail.com>

frontend/package.json

@@ -33,6 +33,7 @@
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-icons": "^4.8.0",
+    "react-intl": "^6.3.1",
     "sharp": "^0.31.3",
     "yup": "^1.0.2"
   },