Update list of outdated translations When *any* language has changed

Makefile

@@ -187,6 +187,6 @@ SIDECAR_FILES := $(shell find . -name '*.en.xhtml' | grep -v ./tags | sort | sed
 all: outdatedtranslations $(SIDECAR_FILES)
 outdatedtranslations:
 	echo "* Updating lists of outdated files"
-.%.outdated-translations: %
+.%.en.xhtml.outdated-translations: %.??.xhtml
 	echo "*   Updating $@"
 	tools/find-outdated-translations "$<" > "$@"