Clean some string code

src/karts/kart_properties.hpp

@@ -458,7 +458,7 @@ public:
       */
     core::stringw getName() const
     {
-        return core::stringw(translations->w_gettext(m_name.c_str()));
+        return _LTR(m_name.c_str());
     }
 
     // ------------------------------------------------------------------------

src/utils/string_utils.cpp

@@ -25,12 +25,13 @@
 
 #include "coreutil.h"
 
-#include <math.h>
 #include <algorithm>
+#include <cassert>
+#include <cmath>
+#include <cstdio>
 #include <cstring>
-#include <stdio.h>
+#include <cwchar>
 #include <exception>
-#include <assert.h>
 
 namespace StringUtils
 {

src/utils/string_utils.hpp

@@ -175,6 +175,7 @@ namespace StringUtils
     std::string insertValues(const std::string &s, Args ...args)
     {
         std::vector<std::string> all_vals;
+        all_vals.reserve(sizeof...(args));
         __FillStringVector::__FillS(all_vals, std::forward<Args>(args)...);
         return insertValues(s, all_vals);
     }
@@ -190,6 +191,7 @@ namespace StringUtils
     irr::core::stringw insertValues(const irr::core::stringw &s, Args ...args)
     {
         std::vector<irr::core::stringw> all_vals;
+        all_vals.reserve(sizeof...(args));
         __FillStringVector::__FillW(all_vals, std::forward<Args>(args)...);
         return insertValues(s, all_vals);
     }