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>

localization/strings.pot

@@ -2077,3 +2077,55 @@ msgstr ""
 
 msgid "A product or a note is required"
 msgstr ""
+
+msgid "grocycode"
+msgstr ""
+
+msgid "Download"
+msgstr ""
+
+msgid "Download stock entry grocycode"
+msgstr ""
+
+msgid "Download product grocycode"
+msgstr ""
+
+msgid "grocycode is a unique referer to this product in your grocy instance - print it onto a label and scan it like any other barcode"
+msgstr ""
+
+# Abbreviation for "due date"
+msgid "DD"
+msgstr ""
+
+msgid "Print on label printer"
+msgstr ""
+
+msgid "Stock entry label"
+msgstr ""
+
+msgid "No label"
+msgstr ""
+
+msgid "Single label"
+msgstr ""
+
+msgid "Label per unit"
+msgstr ""
+
+msgid "Allow label printing per unit"
+msgstr ""
+
+msgid "Allow printing of one label per unit on purchase (after conversion) - e.g. 1 purchased pack adding 10 pieces of stock would print 10 labels"
+msgstr ""
+
+msgid "Error while executing WebHook"
+msgstr ""
+
+msgid "Print product grocycode on label printer"
+msgstr ""
+
+msgid "Print stock entry grocycode on label printer"
+msgstr ""
+
+msgid "Open stock entry print label in new window"
+msgstr ""