Grocycode, label printing (#1500)

* Grocycode: Productpicker, StockService

* Grocycode: Datamatrix generation

* Grocycode: Display in UI, make Images downloadable

* Grocycode: Do not show on product card

* Grocycode: Stockentry Label view

* Grocycode: Webhooks & Labelprinter Feature

* Grocycode: Manual Label printing

* Grocycode: Print Label from product form

* Quagga2: use zxing for DataMatrix recognition

* Grocycode: Default settings for label printing

* Prepare merge of master

* Grocycode: docs

* Docs: label printing webhook

* Review

- "grocy" is currently written lower-case everywhere, so let's do this also for "grocycode"
- Unified phrases / capitalization
- Minor UI adjustments (mainly context menu item ordering / ordering/spacing on product edit page)
- Documented API changes for Swagger UI (grocy.openapi.json)
- Reverted German localizations (those are managed via Transifex; would cause conflicts when manually edited - will import them later there)
- Reverted a somehow messed up localization string (productform/help text for `cumulate_min_stock_amount_of_sub_products`)
- Suppress deprecation warnings when generating Datamatrix PNG (otherwise the PNG is invalid, https://github.com/jucksearm/php-barcode/issues/3)
- Default `FEATURE_FLAG_LABELPRINTER` to disabled

Co-authored-by: Bernd Bestel <bernd@berrnd.de>

views/stockoverview.blade.php

@@ -298,6 +298,20 @@
 									href="{{ $U('/product/') }}{{ $currentStockEntry->product_id . '?returnto=%2Fstockoverview' }}">
 									<span class="dropdown-item-text">{{ $__t('Edit product') }}</span>
 								</a>
+								<div class="dropdown-divider"></div>
+								<a class="dropdown-item stockentry-grocycode-link"
+									type="button"
+									href="{{ $U('/product/' . $currentStockEntry->product_id . '/grocycode?download=true') }}">
+									{{ $__t('Download product grocycode') }}
+								</a>
+								@if(GROCY_FEATURE_FLAG_LABELPRINTER)
+								<a class="dropdown-item stockentry-grocycode-product-label-print"
+									data-product-id="{{ $currentStockEntry->product_id }}"
+									type="button"
+									href="#">
+									{{ $__t('Print product grocycode on label printer') }}
+								</a>
+								@endif
 							</div>
 						</div>
 					</td>
@@ -308,7 +322,8 @@
 					<td>
 						@if($currentStockEntry->product_group_name !== null){{ $currentStockEntry->product_group_name }}@endif
 					</td>
-					<td data-order={{ $currentStockEntry->amount }}>
+					<td data-order={{
+						$currentStockEntry->amount }}>
 						<span id="product-{{ $currentStockEntry->product_id }}-amount"
 							class="locale-number locale-number-quantity-amount">{{ $currentStockEntry->amount }}</span> <span id="product-{{ $currentStockEntry->product_id }}-qu-name">{{ $__n($currentStockEntry->amount, $currentStockEntry->qu_unit_name, $currentStockEntry->qu_unit_name_plural) }}</span>
 						<span id="product-{{ $currentStockEntry->product_id }}-opened-amount"