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/pages/admin/chat/emojis.tsx

@@ -14,6 +14,8 @@ import {
 } from '../../../utils/input-statuses';
 import { RESET_TIMEOUT } from '../../../utils/config-constants';
 import { AdminLayout } from '../../../components/layouts/AdminLayout';
+import { Translation } from '../../../components/ui/Translation/Translation';
+import { Localization } from '../../../types/localization';
 
 const URL_CUSTOM_EMOJIS = `/api/emoji`;
 
@@ -135,18 +137,14 @@ const Emoji = () => {
 
   return (
     <div>
-      <Title>Emojis</Title>
+      <Title>
+        <Translation translationKey={Localization.Admin.emojis} />
+      </Title>
       <Paragraph>
-        Here you can upload new custom emojis for usage in the chat. When uploading a new emoji, the
-        filename without extension will be used as emoji name. Additionally, emoji names are
-        case-insensitive. For best results, ensure all emoji have unique names.
+        <Translation translationKey={Localization.Admin.emojiPageDescription} />
       </Paragraph>
       <Paragraph>
-        {t('Want to upload custom emojis in bulk? Check out our')}{' '}
-        <a href="https://owncast.online/docs/chat/emoji" rel="noopener noreferrer" target="_blank">
-          {t('Emoji guide')}
-        </a>
-        .
+        <Translation translationKey={Localization.Admin.emojiUploadBulkGuide} />
       </Paragraph>
       <br />
       <Upload
@@ -160,7 +158,7 @@ const Emoji = () => {
         disabled={loading}
       >
         <Button type="primary" disabled={loading}>
-          Upload new emoji
+          <Translation translationKey={Localization.Admin.uploadNewEmoji} />
         </Button>
       </Upload>
       <FormStatusIndicator status={submitStatus} />
@@ -186,7 +184,7 @@ const Emoji = () => {
                     <Button
                       size="small"
                       type="ghost"
-                      title="Delete emoji"
+                      title={t(Localization.Admin.deleteEmoji)}
                       style={{
                         position: 'absolute',
                         right: 0,