Provide pretty printing of Euro

Also improved comments and docstring including TODO.

bt5/erp5_commerce/SkinTemplateItem/portal_skins/erp5_commerce/SaleOrder_getFormattedTotalPrice.xml

@@ -50,7 +50,16 @@
         </item>
         <item>
             <key> <string>_body</string> </key>
-            <value> <string>return \'%s %s\' %(context.getTotalPrice(), context.getPriceCurrencyTitle())\n
+            <value> <string>"""\n
+  Return the price and currency, with some\n
+  ad-hoc pretty printing\n
+\n
+  TODO:\n
+  - implement generic pretty printing of currencies\n
+"""\n
+price_currency_title = context.getPriceCurrencyTitle()\n
+if price_currency_title == "Euro": price_currency_title = "€"\n
+return \'%s %s\' %(context.getTotalPrice(), price_currency_title)\n
 </string> </value>
         </item>
         <item>