Use wxUILocale in wxNumberFormatter

Always use the UI locale conventions for floating point numbers in
wxNumberFormatter, making it different from wxString::{To,From}Double()
functions that use C locale, which may, or not, correspond to the UI
locale.

interface/wx/numformatter.h

@@ -8,11 +8,15 @@
 /**
     @class wxNumberFormatter
 
-    Helper class for formatting and parsing numbers with thousands separators.
+    Formatting and parsing numbers using the current UI locale conventions,
+    including support for using the correct decimal point character and
+    thousands separators.
 
     This class contains only static functions, so users must not create instances
     but directly call the member functions.
 
+    @see wxUILocale
+
     @since 2.9.2
 
     @library{wxbase}
@@ -32,7 +36,7 @@ public:
 
         /**
             If this flag is given, thousands separators will be inserted in the
-            number string representation as defined by the current locale.
+            number string representation as defined by the current UI locale.
          */
         Style_WithThousandsSep  = 0x01,
 
@@ -56,7 +60,7 @@ public:
         Returns string representation of an integer number.
 
         By default, the string will use thousands separators if appropriate for
-        the current locale. This can be avoided by passing Style_None as @a
+        the current UI locale. This can be avoided by passing Style_None as @a
         flags in which case the call to the function has exactly the same
         effect as <code>wxString::Format("%ld", val)</code>.
 
@@ -94,7 +98,7 @@ public:
         Parse a string representation of a number possibly including thousands
         separators.
 
-        These functions parse number representation in the current locale. On
+        These functions parse number representation in the current UI locale. On
         success they return @true and store the result at the location pointed
         to by @a val (which can't be @NULL), otherwise @false is returned.
 
@@ -114,7 +118,7 @@ public:
     //@}
 
     /**
-        Get the decimal separator for the current locale.
+        Get the decimal separator for the current UI locale.
 
         Decimal separators is always defined and we fall back to returning '.'
         in case of an error.
@@ -123,14 +127,14 @@ public:
 
     /**
         Get the thousands separator if grouping of the digits is used by the
-        current locale.
+        current UI locale.
 
         The value returned in @a sep should be only used if the function
         returns @true, otherwise no thousands separator should be used at all.
 
         @param sep
             Points to the variable receiving the thousands separator character
-            if it is used by the current locale. May be @NULL if only the
+            if it is used by the current UI locale. May be @NULL if only the
             function return value is needed.
      */
     static bool GetThousandsSeparatorIfUsed(wxChar *sep);