Issue #14 path in role.rb is wrong - change code

* removed invalid alternative pathj to roles.yml in
app/models/cms/fortress/role.rb and added exception
handling, if the file is not found.
* add error message css
* add Exception folder ibn models with exception
MissingRoleCconfigurationFile
Added further translations

I am not 100% sure with the changes in application_helper.rb. If
a developer forgets to add translations for all new roles
in roles.yml, it will trow an error. mybe this has to be done
better.
TinyMCE improvements

* added also the table plugin to tinymce because one will use it eventually
* added the tinymce-rails-langs gem to the Gemfile

i18n additions

* added some translations to the localisation files
* removed trailing comma in wide.js
merged pull request and fixed some conflicts
Merge branch 'andywenk-i18n-additions'