i18n(excel-import-wizard): +19 translations (full wizard + fix Step 4 count)

Full page translation across all 4 steps (upload / map columns / preview /
done), including form labels, buttons, helper text, empty state, and
final result summary. Notification 'N poziții importate' now built via
__(':n')-placeholder so it translates on RU/EN.

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

resources/views/filament/tenant/pages/excel-import-wizard.blade.php

@@ -214,7 +214,7 @@
             <div style="text-align:center;padding:32px;">
                 <div style="font-size:48px;margin-bottom:16px;">✅</div>
                 <h2 style="font-size:20px;font-weight:600;margin-bottom:8px;">{{ __('Import finalizat cu succes') }}</h2>
-                <p style="color:#4a5568;">{{ $previewSummary['total'] }} poziții importate în Purchase nouă</p>
+                <p style="color:#4a5568;">{{ __(':n poziții importate în Purchase nouă', ['n' => $previewSummary['total']]) }}</p>
                 <div style="margin-top:24px;">
                     @if (session('purchase_id'))
                         <a class="wiz-btn wiz-btn-primary" href="{{ route('filament.tenant.resources.purchases.edit', ['record' => session('purchase_id')]) }}">{{ __('↗ Deschide Purchase') }}</a>