Feature: Adding Translation Service and Translation Seeder

src/Localization/Filament/Resources/LanguageLineResource.php

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+<?php
+
+namespace Modules\Core\Localization\Filament\Resources;
+
+use Filament\Forms;
+use Filament\Forms\Form;
+use Filament\Resources\Resource;
+use Filament\Tables;
+use Filament\Tables\Table;
+use Lunar\Models\Language;
+use Modules\Core\Localization\Filament\Resources\LanguageLineResource\Pages;
+use Spatie\TranslationLoader\LanguageLine;
+
+class LanguageLineResource extends Resource
+{
+    protected static ?string $model = LanguageLine::class;
+
+    protected static ?string $navigationIcon = 'heroicon-o-language';
+
+    protected static ?string $navigationGroup = 'Settings';
+
+    protected static ?string $modelLabel = 'Translation';
+
+    protected static ?string $pluralModelLabel = 'Translations';
+
+    public static function form(Form $form): Form
+    {
+        return $form->schema([
+            Forms\Components\TextInput::make('group')
+                ->required()
+                ->maxLength(255)
+                ->default('storefront')
+                ->helperText('Namespace for this label, e.g. "storefront" for e-shop UI text.'),
+
+            Forms\Components\TextInput::make('key')
+                ->required()
+                ->maxLength(255)
+                ->helperText('Dot-notation key, e.g. "nav.cart".'),
+
+            Forms\Components\Fieldset::make('Translations')
+                ->schema(static::localeInputs()),
+        ]);
+    }
+
+    public static function table(Table $table): Table
+    {
+        return $table
+            ->columns([
+                Tables\Columns\TextColumn::make('group')
+                    ->badge()
+                    ->sortable(),
+                Tables\Columns\TextColumn::make('key')
+                    ->searchable()
+                    ->sortable(),
+                ...static::localeColumns(),
+            ])
+            ->filters([
+                Tables\Filters\SelectFilter::make('group')
+                    ->options(fn () => LanguageLine::query()->distinct()->pluck('group', 'group')),
+            ])
+            ->defaultSort('key');
+    }
+
+    public static function getRelations(): array
+    {
+        return [];
+    }
+
+    public static function getPages(): array
+    {
+        return [
+            'index' => Pages\ListLanguageLines::route('/'),
+            'create' => Pages\CreateLanguageLine::route('/create'),
+            'edit' => Pages\EditLanguageLine::route('/{record}/edit'),
+        ];
+    }
+
+    /**
+     * @return array<Forms\Components\Textarea>
+     */
+    private static function localeInputs(): array
+    {
+        return static::localeCodes()
+            ->map(fn (string $code) => Forms\Components\Textarea::make("text.{$code}")
+                ->label(strtoupper($code))
+                ->rows(2))
+            ->all();
+    }
+
+    /**
+     * @return array<Tables\Columns\TextColumn>
+     */
+    private static function localeColumns(): array
+    {
+        return static::localeCodes()
+            ->map(fn (string $code) => Tables\Columns\TextColumn::make("text.{$code}")
+                ->label(strtoupper($code))
+                ->limit(40)
+                ->toggleable())
+            ->all();
+    }
+
+    private static function localeCodes(): \Illuminate\Support\Collection
+    {
+        return Language::query()->pluck('code');
+    }
+}

src/Localization/Filament/Resources/LanguageLineResource/Pages/CreateLanguageLine.php

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+<?php
+
+namespace Modules\Core\Localization\Filament\Resources\LanguageLineResource\Pages;
+
+use Filament\Resources\Pages\CreateRecord;
+use Illuminate\Database\Eloquent\Model;
+use Modules\Core\Localization\Filament\Resources\LanguageLineResource;
+use Modules\Core\Localization\TranslationService;
+
+class CreateLanguageLine extends CreateRecord
+{
+    protected static string $resource = LanguageLineResource::class;
+
+    protected function handleRecordCreation(array $data): Model
+    {
+        return app(TranslationService::class)->create(
+            $data['group'],
+            $data['key'],
+            $data['text'] ?? [],
+        );
+    }
+}

src/Localization/Filament/Resources/LanguageLineResource/Pages/EditLanguageLine.php

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+<?php
+
+namespace Modules\Core\Localization\Filament\Resources\LanguageLineResource\Pages;
+
+use Filament\Actions;
+use Filament\Actions\Action;
+use Filament\Resources\Pages\EditRecord;
+use Illuminate\Database\Eloquent\Model;
+use Modules\Core\Localization\Filament\Resources\LanguageLineResource;
+use Modules\Core\Localization\TranslationService;
+use Spatie\TranslationLoader\LanguageLine;
+
+class EditLanguageLine extends EditRecord
+{
+    protected static string $resource = LanguageLineResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\DeleteAction::make()
+                ->action(function (LanguageLine $record) {
+                    app(TranslationService::class)->delete($record);
+
+                    $this->redirect($this->getResource()::getUrl('index'));
+                }),
+        ];
+    }
+
+    /**
+     * Filament's default Cancel button uses window.history.back(), which
+     * restores the browser's cached previous page instead of re-fetching —
+     * so an edit made just before clicking Cancel doesn't show up in the
+     * list until a manual refresh. Redirect through Livewire instead, which
+     * always re-queries.
+     */
+    protected function getCancelFormAction(): Action
+    {
+        return Action::make('cancel')
+            ->label(__('filament-panels::resources/pages/edit-record.form.actions.cancel.label'))
+            ->url(static::getResource()::getUrl('index'))
+            ->color('gray');
+    }
+
+    protected function handleRecordUpdate(Model $record, array $data): Model
+    {
+        return app(TranslationService::class)->update(
+            $record,
+            $data['group'],
+            $data['key'],
+            $data['text'] ?? [],
+        );
+    }
+}

src/Localization/Filament/Resources/LanguageLineResource/Pages/ListLanguageLines.php

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+<?php
+
+namespace Modules\Core\Localization\Filament\Resources\LanguageLineResource\Pages;
+
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+use Modules\Core\Localization\Filament\Resources\LanguageLineResource;
+
+class ListLanguageLines extends ListRecords
+{
+    protected static string $resource = LanguageLineResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+}