Create custom Translation component for better i18n handling (#4431)

* Initial plan

* Implement Translation component with Storybook stories

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Add Jest test for Translation component and demonstrate ?lang=de functionality

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Javascript formatting autofixes

* Create centralized type-safe localization system

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Add @testing-library/react to Translation component tests

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Fix code formatting errors with prettier and eslint

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Revert "Fix code formatting errors with prettier and eslint"

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* fix(js): eslinter errors

* fix(js): unused code warnings

* fix(js): fix additional warnings

* Update Emoji admin page to use new Translation component

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Organize localization keys by logical sections (Frontend, Admin, Common, Testing)

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Organize localization keys by TypeScript namespaces

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* Javascript formatting autofixes

* feat(js): add support for default translated text

* chore: add default lang translations on commit

* fix(js): unused code warnings

* Update OfflineBanner component to use new Translation component

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* fix(js): fix localization extraction job

* chore(js): remove ts-node cli

* fix(css): fix css warning

* feat(js): add some additional translation strings via component

* chore: update extracted translations

* test: add tests for Translation component defaultText and fallback behavior

Co-authored-by: gabek <414923+gabek@users.noreply.github.com>

* chore: update extracted translations

* Javascript formatting autofixes

* chore: call out new Translation component

* fix: linter warning

* chore: updated instructions

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: gabek <414923+gabek@users.noreply.github.com>
Co-authored-by: Owncast <owncast@owncast.online>
Co-authored-by: Gabe Kangas <gabek@real-ity.com>

web/components/ui/Footer/Footer.tsx

@@ -4,6 +4,8 @@ import { useTranslation } from 'next-export-i18n';
 import styles from './Footer.module.scss';
 import { ServerStatus } from '../../../interfaces/server-status.model';
 import { serverStatusState } from '../../stores/ClientConfigStore';
+import { Localization } from '../../../types';
+import Translation from '../Translation/Translation';
 
 export const Footer: FC = () => {
   const clientStatus = useRecoilValue<ServerStatus>(serverStatusState);
@@ -12,8 +14,11 @@ export const Footer: FC = () => {
   return (
     <footer className={styles.footer} id="footer">
       <span>
-        {t('Powered by Owncast')}
-        <a href="https://owncast.online">&nbsp;v{versionNumber}</a>
+        <Translation
+          translationKey={Localization.Common.poweredByOwncastVersion}
+          vars={{ versionNumber }}
+          defaultText="Powered by <a href='https://owncast.online'>Owncast v{{versionNumber}}</a>"
+        />
       </span>
       <span className={styles.links}>
         <a href="https://owncast.online/docs" target="_blank" rel="noreferrer">