fix(purchases): actually apply CreateAction override

Previous commit added the translation entries but the Edit call
failed silently (file-not-read guard). Now the CreateAction has
->label(__('Adaugă articol')) + ->modalHeading(__('Adaugă articol
în comandă')) so RU/EN see translated modal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Filament/Tenant/Resources/PurchaseResource/RelationManagers/ItemsRelationManager.php

@@ -71,7 +71,9 @@ class ItemsRelationManager extends RelationManager
                 Tables\Columns\TextColumn::make('total')->money('MDL')->alignRight(),
             ])
             ->headerActions([
-                Actions\CreateAction::make(),
+                Actions\CreateAction::make()
+                    ->label(__('Adaugă articol'))
+                    ->modalHeading(__('Adaugă articol în comandă')),
             ])
             ->actions([
                 Actions\Action::make('receive_item')