Use singular localization form when plural form is not provided (closes #1878)

changelog/68_UNRELEASED_xxxx-xx-xx.md

@@ -11,6 +11,7 @@
 - New product option "Move on open" (defaults to disabled)
   - When enabled, on marking the product as opened, the corresponding amount will be moved to the products default consume location
   - (Thanks @RosemaryOrchard)
+- Optimized that when the plural form(s) of a quantity unit is/are not provided, the singular form is used to display plural amounts
 - Fixed "Automatically add products that are below their defined min. stock amount to the shopping list" (stock setting) was only done when consuming products, not when opening them
 
 ### Shopping list

public/js/grocy.js

@@ -257,6 +257,11 @@ __n = function(number, singularForm, pluralForm, isQu = false)
 		}
 	}
 
+	if (pluralForm.isEmpty())
+	{
+		pluralForm = singularForm;
+	}
+
 	if (isQu)
 	{
 		return Grocy.TranslatorQu.n__(singularForm, pluralForm, Math.abs(number), Math.abs(number))

services/LocalizationService.php

@@ -78,6 +78,11 @@ class LocalizationService
 	{
 		$this->CheckAndAddMissingTranslationToPot($singularForm);
 
+		if (empty($pluralForm))
+		{
+			$pluralForm = $singularForm;
+		}
+
 		if ($isQu)
 		{
 			return sprintf($this->TranslatorQu->ngettext($singularForm, $pluralForm, abs(floatval($number))), $number);
@@ -218,6 +223,7 @@ class LocalizationService
 				$translation = new Translation('', $quantityUnit['name']);
 				$translation->setTranslation($quantityUnit['name']);
 				$translation->setPlural($quantityUnit['name_plural']);
+
 				$translation->setPluralTranslations(preg_split('/\r\n|\r|\n/', $quantityUnit['plural_forms']));
 
 				$this->PoQu[] = $translation;