i18n(parts-edit): override CreateAction, +19 translations for tabs/columns/empty

- CrossRefsRelationManager: explicit CreateAction/EditAction labels &
  modal headings (was auto-generated as 'Create Part Cross Ref')
- +19 translations for PartResource sections (Prețuri, Furnizor
  preferat), photo gallery helper, relation-tab titles (Loturi FIFO,
  Coduri cross), Batches columns (Intrat/Rămas/Preț unit.), CrossRefs
  column (Cod echivalent), all empty-state headings/descriptions on
  the 3 relation managers, Val. abbreviation.

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

app/Filament/Tenant/Resources/PartResource/RelationManagers/CrossRefsRelationManager.php

@@ -36,8 +36,15 @@ class CrossRefsRelationManager extends RelationManager
                 Tables\Columns\TextColumn::make('cross_article')->label(__('Cod'))->searchable(),
                 Tables\Columns\TextColumn::make('brand')->placeholder('—'),
             ])
-            ->headerActions([Actions\CreateAction::make()])
-            ->actions([Actions\EditAction::make(), Actions\DeleteAction::make()])
+            ->headerActions([
+                Actions\CreateAction::make()
+                    ->label(__('Adaugă cod cross'))
+                    ->modalHeading(__('Adaugă cod echivalent')),
+            ])
+            ->actions([
+                Actions\EditAction::make()->modalHeading(__('Editează cod echivalent')),
+                Actions\DeleteAction::make(),
+            ])
             ->emptyStateHeading(__('Niciun cod cross'))
             ->emptyStateDescription(__('Adaugă coduri echivalente OEM/aftermarket ca să fie găsite în căutarea din magazin.'));
     }