chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/utils/i18n.ts

@@ -0,0 +1,37 @@
+import {
+  enUS,
+  de,
+  faIR,
+  fr,
+  es,
+  it,
+  ja,
+  ko,
+  ptBR,
+  pt,
+  zhCN,
+  zhTW,
+  ru,
+  pl,
+} from "date-fns/locale";
+
+const locales = {
+  en_US: enUS,
+  de_DE: de,
+  es_ES: es,
+  fa_IR: faIR,
+  fr_FR: fr,
+  it_IT: it,
+  ja_JP: ja,
+  ko_KR: ko,
+  pt_BR: ptBR,
+  pt_PT: pt,
+  zh_CN: zhCN,
+  zh_TW: zhTW,
+  ru_RU: ru,
+  pl_PL: pl,
+};
+
+export function dateLocale(userLocale: string | null | undefined) {
+  return userLocale ? locales[userLocale] : undefined;
+}