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>

public/js/grocy.js

@@ -476,6 +476,24 @@ Grocy.FrontendHelpers.DeleteUserSetting = function(settingsKey, reloadPageOnSucc
 	);
 }
 
+Grocy.FrontendHelpers.RunWebhook = function(webhook, data, repetitions = 1)
+{
+	Object.assign(data, webhook.extra_data);
+	var hasAlreadyFailed = false;
+
+	for (i = 0; i < repetitions; i++)
+	{
+		$.post(webhook.hook, data).fail(function(req, status, errorThrown)
+		{
+			if (!hasAlreadyFailed)
+			{
+				hasAlreadyFailed = true;
+				Grocy.FrontendHelpers.ShowGenericError(__t("Error while executing WebHook", { "status": status, "errorThrown": errorThrown }));
+			}
+		});
+	}
+}
+
 $(document).on("keyup paste change", "input, textarea", function()
 {
 	$(this).closest("form").addClass("is-dirty");