Add vietnamese language

common/pgm_base.cpp

@@ -91,6 +91,7 @@ LANGUAGE_DESCR LanguagesList[] =
     { wxLANGUAGE_CATALAN,    ID_LANGUAGE_CATALAN,    wxT( "Català" ),   true },
     { wxLANGUAGE_JAPANESE,   ID_LANGUAGE_JAPANESE,   wxT( "日本語" ),    true },
     { wxLANGUAGE_LITHUANIAN, ID_LANGUAGE_LITHUANIAN, wxT( "Lietuvių" ), true },
+    { wxLANGUAGE_VIETNAMESE, ID_LANGUAGE_VIETNAMESE, wxT( "Tiếng việt" ), true },
     { 0, 0, "", false }         // Sentinel
 };
 #undef _

include/id.h

@@ -138,6 +138,7 @@ enum main_id
     ID_LANGUAGE_JAPANESE,
     ID_LANGUAGE_BULGARIAN,
     ID_LANGUAGE_LITHUANIAN,
+    ID_LANGUAGE_VIETNAMESE,
     ID_LANGUAGE_CHOICE_END,
 
     // Popup Menu (mouse Right button) (id consecutifs)