BISERVER-11099 - 404 message for .properties files requested by jquery.i...

...18n plugin

jquery.i18n.properties.supported.languages.js is default 'common-ui/jquery-i18n' module now. It will look for _supported_languages.properties and check available locales from there. If that file is empty, only messages.properties will be loaded. If this file is missing, the plugin will try to load locale from properties as was before.