NLS: Use msgmerge --previous option

It provides some additional help to translators.

diff --git a/src/nls-global.mk b/src/nls-global.mk
index e6c4a633a4395f620e9bcddee63e73642c32f726..8f06e2d24fd85dd5c317a99a7ec8c87e42525d23 100644 (file)
--- a/src/nls-global.mk
+++ b/src/nls-global.mk
@@ -44,7 +44,7 @@ XGETTEXT += -ctranslator --copyright-holder='PostgreSQL Global Development Group
 endif
 
 ifdef MSGMERGE
-MSGMERGE += --no-wrap --sort-by-file
+MSGMERGE += --no-wrap --previous --sort-by-file
 endif
 
 # _ is defined in c.h, so it's global