Add new updatepo target that calls `make updatepo' in all subdirectories.

man/ChangeLog

@@ -2,5 +2,8 @@
 
 	* C/po/*.pot: Update.
 
+	* Makefile.am (updatepo): New target that calls
+	`make updatepo' in all subdirectories.
+
 
 Older changes are documented in the top-level ChangeLog

man/Makefile.am

@@ -2,3 +2,9 @@
 
 # C must be the first sub-directory because it contains the POT files.
 SUBDIRS = C de es fr hu ja pt_BR ru sv
+
+.PHONY: updatepo
+updatepo:
+	list='$(SUBDIRS)'; for dir in $$list; do \
+		$(MAKE) -C "$$dir" updatepo; \
+	done