Merge pull request #73 from shiyj/master

using error code instead of the long desc strings;

cm_backtrace/cm_backtrace.c

@@ -112,6 +112,8 @@ static const char * const print_info[] = {
     #include "Languages/zh-CN/cmb_zh_CN.h"
 #elif (CMB_PRINT_LANGUAGE == CMB_PRINT_LANGUAGE_CHINESE_UTF8)
     #include "Languages/zh-CN/cmb_zh_CN_UTF8.h"
+#elif (CMB_PRINT_LANGUAGE == CMB_PRINT_LANGUAGE_CUSTOM)
+    #include "cmb_language_custom.h"
 #else
     #error "CMB_PRINT_LANGUAGE defined error in 'cmb_cfg.h'"
 #endif

cm_backtrace/cmb_def.h

@@ -51,6 +51,7 @@
 #define CMB_PRINT_LANGUAGE_ENGLISH        0
 #define CMB_PRINT_LANGUAGE_CHINESE        1
 #define CMB_PRINT_LANGUAGE_CHINESE_UTF8   2
+#define CMB_PRINT_LANGUAGE_CUSTOM         0xFF
 
 /* name max length, default size: 32 */
 #ifndef CMB_NAME_MAX