Use go run for xgettext-go

Before: on a mac, the Makefile downloaded a linux file, which did not work
for updating the i18n.

Now: use 'go run' to run the xgettext-go file. go caches it, so it compiles only
once.

Makefile

@@ -1,5 +1,5 @@
 ABRA         := ./cmd/abra
-XGETTEXT     := ./bin/xgettext-go
+XGETTEXT     := go run git.coopcloud.tech/toolshed/xgettext-go@latest
 COMMIT       := $(shell git rev-list -1 HEAD)
 GOPATH       := $(shell go env GOPATH)
 GOVERSION    := 1.26
@@ -62,8 +62,8 @@ update-po:
 	done
 
 .PHONY: update-pot
-update-pot: $(XGETTEXT)
-	@${XGETTEXT} \
+update-pot:
+	@$(XGETTEXT) \
 		-o pkg/i18n/locales/$(DOMAIN).pot \
 		--keyword=i18n.G \
 		--keyword-ctx=i18n.GC \
@@ -71,11 +71,6 @@ update-pot: $(XGETTEXT)
 		--add-comments-tag="translators" \
 		$$(find . -name "*.go" -not -path "*vendor*" | sort)
 
-${XGETTEXT}:
-	@mkdir -p ./bin && \
-	wget -O ./bin/xgettext-go https://git.coopcloud.tech/toolshed/xgettext-go/raw/branch/main/xgettext-go && \
-	chmod +x ./bin/xgettext-go
-
 .PHONY: update-pot-po-metadata
 update-pot-po-metadata:
 	@sed -i "s/charset=CHARSET/charset=UTF-8/g" pkg/i18n/locales/*.po pkg/i18n/locales/*.pot