patch 9.0.1410: MacOS: sed fails on .po files

Problem:    MacOS: sed fails on .po files.
Solution:   Set $LANG to "C". (Yee Cheng Chin, closes #12153)
diff --git a/src/po/Make_all.mak b/src/po/Make_all.mak
index b2fa014..89cbb15 100644
--- a/src/po/Make_all.mak
+++ b/src/po/Make_all.mak
@@ -105,7 +105,6 @@
 		it.mo \
 		ja.mo \
 		ko.UTF-8.mo \
-		ko.mo \
 		lv.mo \
 		nb.mo \
 		nl.mo \
@@ -121,13 +120,13 @@
 		vi.mo \
 		zh_CN.UTF-8.mo \
 		zh_TW.UTF-8.mo \
-		zh_TW.mo \
 
 
 MOCONVERTED = \
 		cs.cp1250.mo \
 		ja.euc-jp.mo \
 		ja.sjis.mo \
+		ko.mo \
 		pl.UTF-8.mo \
 		pl.cp1250.mo \
 		ru.cp1251.mo \
@@ -135,6 +134,7 @@
 		uk.cp1251.mo \
 		zh_CN.mo \
 		zh_CN.cp936.mo \
+		zh_TW.mo \
 
 
 CHECKFILES = \