Max title length

* adjusted i18n messages
* adjusted the Config:$title_max_length to 240
* changed the title logic: no longer truncate the title; issue an exception
  when the title is too long
* changed the key gwtoolset-title-identifier to gwtoolset-title for
  clarity within the metadata mapping form and in the code

Bug: 65323
Change-Id: I92dfe622e40bf9873e0b0c615a0d0ad8a9daf3e0