Refactor i18n approach (#2875)

* Refactor i18n approach

* chore: move to shared

* chore: add default

* create DialogService and update LoadingService (#2876)

* complete translation infra for ui project, currently broken

* cleanup and more dictionaries

* chore: fix

---------

Co-authored-by: Matt Hill <MattDHill@users.noreply.github.com>
Co-authored-by: Matt Hill <mattnine@protonmail.com>

web/projects/shared/src/i18n/i18n.providers.ts

@@ -0,0 +1,53 @@
+import { forwardRef, signal } from '@angular/core'
+import { tuiCreateToken, tuiProvide } from '@taiga-ui/cdk'
+import {
+  TuiLanguageName,
+  tuiLanguageSwitcher,
+  TuiLanguageSwitcherService,
+} from '@taiga-ui/i18n'
+import { ENGLISH } from './dictionaries/english'
+import { i18nService } from './i18n.service'
+
+export type i18nKey = keyof typeof ENGLISH
+export type i18n = Record<(typeof ENGLISH)[i18nKey], string>
+
+export const I18N = tuiCreateToken(signal<i18n | null>(null))
+export const I18N_LOADER =
+  tuiCreateToken<(lang: TuiLanguageName) => Promise<i18n>>()
+export const I18N_STORAGE = tuiCreateToken<
+  (lang: TuiLanguageName) => Promise<void>
+>(() => Promise.resolve())
+
+export const I18N_PROVIDERS = [
+  tuiLanguageSwitcher(async (language: TuiLanguageName): Promise<unknown> => {
+    switch (language) {
+      case 'spanish':
+        return import('@taiga-ui/i18n/languages/spanish')
+      case 'polish':
+        return import('@taiga-ui/i18n/languages/polish')
+      case 'german':
+        return import('@taiga-ui/i18n/languages/german')
+      default:
+        return import('@taiga-ui/i18n/languages/english')
+    }
+  }),
+  {
+    provide: I18N_LOADER,
+    useValue: async (language: TuiLanguageName): Promise<unknown> => {
+      switch (language) {
+        case 'spanish':
+          return import('./dictionaries/spanish').then(v => v.default)
+        case 'polish':
+          return import('./dictionaries/polish').then(v => v.default)
+        case 'german':
+          return import('./dictionaries/german').then(v => v.default)
+        default:
+          return null
+      }
+    },
+  },
+  tuiProvide(
+    TuiLanguageSwitcherService,
+    forwardRef(() => i18nService),
+  ),
+]