Re #1206 - multilang: My Europeana, Language Settings

* remove debug flag
* allow new My Europeana to handle login, register, new password request
* re-factor ajax calls so that they send modificationAction instead of className
* re-factor modification actions from SavedItem, SavedSearch, SocialTag, ApiKey,
  to saved_item, saved_search, social_tag, api_key to match enumeration list in
  the AjaxController
* re-factor cookie keys from portalLanguage, searchLanguages, itemLanguage to
  languagePortal, languageSearch, languageItem to match values in the
  AjaxController