Fix default sort ref #110

this adds code to the model for list views and related list views so that if no sort order is manually specified (someone hasn't clicked a column header) then it checks to see if the performance preference for default sorting is turned on and uses the sort order specified for the module. ref issue #110

See merge request !34

if the preference LISTVIEW_DEFAULT_SORTING is specified then use it for list views and related lists

This reverts commit ad55e288.

Add french translations to Calendar.php

See merge request !23

fix #99 add missing vtranslate function in tpl files

Fix issue #99

Also need to add translation in lang files (new issue). I can add ru_ru localization.

See merge request !27