Add localization for templates and vars, with CakePHP i18n table.

[cruamps]

Notifier now accepts translated templates and vars.

Translated templates can be managed with addI18nTemplate()and getI18nTemplate().

Translated vars are stored into i18n table :
http://book.cakephp.org/3.0/en/orm/behaviors/translate.html#initializing-the-i18n-database-table
Notification table did not change.

Notifications are saved with notifyI18n().
Title and body of translated notification can be retrieved with $entity->getI18n('title', 'en')or $entity->getI18n('body', 'fr').

[bobmulder]

First of all, thank you for the Pull Request! I am glad to see you added tests of your code, but the build failed because of the codestandard. You should fix that ;)

I would like to discuss about the fact that you created all kind of new methods. (with I18n in it). Why did you choose for that, instead of extending the existing methods?

Good work!

[coveralls]

Coverage decreased (-1.6%) to 79.275% when pulling d2da383 on cruamps:master-i18n into 80bb26c on cakemanager:master.

[cruamps]

Thank you @bobmulder
I am a beginner in opensource CakePHP development, so I did not know much about codestandard.
I just fixed that, and I will increase coverage soon.

I saw this kind of methods (with I18n) in some CMS plugins, and I did not want to alter your code for my first pull request.
How would you have done ? Maybe adding a parameter $options = [] including key i18n ?

[bobmulder]

Thats no problem @cruamps. If you have questions, feel free to ask!

Well, when just thinking about how we would like to program, I was thinking about:

$notificationManager->addTemplate('newBlog', [
    'title' => 'New blog by :username',
    'body' => ':username has posted a new blog named :name',
    'lang' => 'en'
]);

The lang key is not required. When it's not given, the template would be 'saved' as default. When using the notifcation (so when the template is used), the code should recognize the prefered language...