patch 9.0.1799: Russian menu translation can be improved

Problem:  Russian menu translation can be improved
Solution: update the Russian menu files

closes: #12903

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: RestorerZ <restorer@mail2k.ru>
diff --git a/runtime/lang/Makefile b/runtime/lang/Makefile
index b4e524a..fb76239 100644
--- a/runtime/lang/Makefile
+++ b/runtime/lang/Makefile
@@ -13,6 +13,7 @@
 		menu_pl_pl.iso_8859-2.vim \
 		menu_polish_poland.1250.vim \
 		menu_ru_ru.koi8-r.vim \
+		menu_ru_ru.cp1251.vim \
 		menu_sl_si.cp1250.vim \
 		menu_sl_si.latin2.vim \
 		menu_slovak_slovak_republic.1250.vim \
@@ -113,6 +114,12 @@
 	iconv -f utf-8 -t koi8-r menu_ru_ru.utf-8.vim | \
 		$(SED) -e 's/scriptencoding utf-8/scriptencoding koi8-r/' -e 's/" Original translations/" Generated from menu_ru_ru.utf-8.vim, DO NOT EDIT/' > menu_ru_ru.koi8-r.vim
 
+# Convert menu_ru_ru.utf-8.vim to create menu_ru_ru.cp1251.vim.
+menu_ru_ru.cp1251.vim: menu_ru_ru.utf-8.vim
+	rm -f menu_ru_ru.cp1251.vim
+	iconv -f utf-8 -t cp1251 menu_ru_ru.utf-8.vim | \
+		$(SED) -e 's/scriptencoding utf-8/scriptencoding cp1251/' -e 's/" Original translations/" Generated from menu_ru_ru.utf-8.vim, DO NOT EDIT/' > menu_ru_ru.cp1251.vim
+
 # Convert menu_sl_si.utf-8.vim to create menu_sl_si.cp1250.vim.
 menu_sl_si.cp1250.vim: menu_sl_si.utf-8.vim
 	rm -f menu_sl_si.cp1250.vim