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_sr_rs.ascii.vim b/runtime/lang/menu_sr_rs.ascii.vim
index f62fc82..036f2e2 100644
--- a/runtime/lang/menu_sr_rs.ascii.vim
+++ b/runtime/lang/menu_sr_rs.ascii.vim
@@ -31,7 +31,7 @@
 menutrans &File			    &Fajl
 menutrans &Open\.\.\.<Tab>:e	    &Otvori\.\.\.<Tab>:e
 menutrans Sp&lit-Open\.\.\.<Tab>:sp &Podeli-otvori\.\.\.<Tab>:sp
-menutrans Open\ Tab\.\.\.<Tab>:tabnew	Otvori\ karticu\.\.\.<Tab>:tabnew
+menutrans Open\ &Tab\.\.\.<Tab>:tabnew	Otvori\ karticu\.\.\.<Tab>:tabnew
 menutrans &New<Tab>:enew	    &Nov<Tab>:enew
 menutrans &Close<Tab>:close	    &Zatvori<Tab>:close
 menutrans &Save<Tab>:w		    &Sacuvaj<Tab>:w