feat: msgctxt support

See toolshed/abra#647
See toolshed/xgettext-go#1

Makefile

@@ -78,14 +78,20 @@ update-po:
 	done
 
 .PHONY: update-pot
-update-pot:
-	@xgettext-go \
+update-pot: ./bin/xgettext-go
+	@./bin/xgettext-go \
 		-o pkg/i18n/locales/$(DOMAIN).pot \
 		--keyword=i18n.G \
+		--keyword-ctx=i18n.GC \
 		--sort-output \
 		--add-comments-tag="translators" \
 		$$(find . -name "*.go" -not -path "*vendor*" | sort)
 
+./bin/xgettext-go:
+	@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