Replace errdetail("%s", ...) with errdetail_internal("%s", ...).

There may be some other places where we should use errdetail_internal,
but they'll have to be evaluated case-by-case.  This commit just hits
a bunch of places where invoking gettext is obviously a waste of cycles.

src/backend/commands/user.c

@@ -953,7 +953,7 @@ DropRole(DropRoleStmt *stmt)
 					(errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
 					 errmsg("role \"%s\" cannot be dropped because some objects depend on it",
 							role),
-					 errdetail("%s", detail),
+					 errdetail_internal("%s", detail),
 					 errdetail_log("%s", detail_log)));
 
 		/*