[BUGFIX] Added validate resource, save after error and crop long titles

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | https://github.com/sulu-cmf/sulu-standard/issues/176 , https://github.com/sulu-cmf/sulu-standard/issues/227
| BC Breaks     | none
| Doc           | none