Fix menu localization not updated for "Open Tab..." item (#12993)

THe menu item "Open Tab..." was changed to "Open &Tab..." in #12895 but
localization files were not updated. Update it here.

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/lang/menu_ja_jp.euc-jp.vim b/runtime/lang/menu_ja_jp.euc-jp.vim
index 21138f1..fdb0aca 100644
--- a/runtime/lang/menu_ja_jp.euc-jp.vim
+++ b/runtime/lang/menu_ja_jp.euc-jp.vim
@@ -39,7 +39,7 @@
 menutrans &File				¥Õ¥¡¥¤¥ë(&F)
 menutrans &Open\.\.\.<Tab>:e		³«¤¯(&O)\.\.\.<Tab>:e
 menutrans Sp&lit-Open\.\.\.<Tab>:sp	ʬ³ä¤·¤Æ³«¤¯(&L)\.\.\.<Tab>:sp
-menutrans Open\ Tab\.\.\.<Tab>:tabnew	¥¿¥Ö¥Ú¡¼¥¸¤Ç³«¤¯<Tab>:tabnew
+menutrans Open\ &Tab\.\.\.<Tab>:tabnew	¥¿¥Ö¥Ú¡¼¥¸¤Ç³«¤¯<Tab>:tabnew
 menutrans &New<Tab>:enew		¿·µ¬ºîÀ®(&N)<Tab>:enew
 menutrans &Close<Tab>:close		ÊĤ¸¤ë(&C)<Tab>:close
 menutrans &Save<Tab>:w			Êݸ(&S)<Tab>:w