[WIP]New translation system

- Removed Localizer feature.. replaced with new Symfony2 translation concept.
- Added event listener to load old plugins translations from directory `../newscoop/newscoop/plugins/`
- Added new feature for templators to translate given text:

-- old translation tags usage:

```
{{ #search# }}
```

-- new translation tags usage:

```
{{ 'search'|translate:'translation_domain' }}
```
-- `search` - given text to translate
-- `translation_domain` - name of translation file, for ex. if our translation file name is `custodian.en.yml` then the translation domain is `custodian` and translation strings will be loaded from that file, if translation domain isn't set (`{{ 'search'|translate }}` then default translation domain is used: `theme_translation`.

Translation domains allow you to split translations to many files, ex. `users.en.yml`, `front.en.yml` etc.

-- how to use it with global variables:

```
{{ assign var="welcome" value="{{ 'welcome'|translate }}" }}
```
and call it: `{{ $welcome }}`

-- new translation directory:
`theme_name/translations`

- Translation files can be used in Lingohub.com now