add command to update translations

Author: mr-c

Makefile

@@ -42,6 +42,10 @@ check-json:
 container-pull:
 	for container in $$(git grep dockerPull $$(git ls-files *.cwl) | awk '-F: ' '{print $$3}'); do docker pull $${container}; done
 
+update_translations: gettext
+	sphinx-intl update -p _build/gettext
+
+
 .PHONY: help clean watch unittest-examples check-json Makefile
 
 # Catch-all target		: route all unknown targets to Sphinx using the new