going on a string localization rampage in the default theme. aside from graphics, this should be the last of the non-themeable text that actually matters (unless someone really has to change 'P1'/'P2' on the DifficultyList cursors...)

Themes/default/Graphics/Player judgment/default.lua

@@ -76,7 +76,7 @@ t[#t+1] = Def.ActorFrame {
 	};
 	LoadFont("Common Normal") .. {
 		Name="TextDisplay";
-		Text="MS";
+		Text=THEME:GetString("Protiming","MS");
 		InitCommand=cmd(visible,false);
 		OnCommand=THEME:GetMetric("Protiming","TextOnCommand");
 		ResetCommand=cmd(finishtweening;stopeffect;visible,false);