Replace wxLocale::ms_languagesDB dynamic array with a wxVector

There is no reason to use the macro-based classes for this array as
there are no compatibility constraints here, so use a simple vector
instead.

Note that we need an extra boolean variable now that we don't use a
pointer because we can't just check whether the vector is empty, as this
would return in infinite recursion when InitLanguagesDB() calls
AddLanguage() which, in turn, calls CreateLanguagesDB().

include/wx/intl.h

@@ -35,7 +35,6 @@
 // ----------------------------------------------------------------------------
 
 class WXDLLIMPEXP_FWD_BASE wxLocale;
-class WXDLLIMPEXP_FWD_BASE wxLanguageInfoArray;
 
 // ============================================================================
 // locale support
@@ -285,8 +284,6 @@ private:
 
     wxTranslations m_translations;
 
-    static wxLanguageInfoArray *ms_languagesDB;
-
     wxDECLARE_NO_COPY_CLASS(wxLocale);
 };