Fixes #6101 Unknown providers are now shown as "Unknown" instead of "IP"

Furthermore, the link to the FAQ about this is now hidden when `displayLink` is `1`.

Refactoring in ScheduledReports to remove useless indentation

I have refactored the code a bit to make it (hopefully) more readable. I have replaced this:

```php
if (self::manageEvent($reportType)) {
    // do something
}
```

By this:

```php
if (! self::manageEvent($reportType)) {
    return;
}

// do something
```

It's not much but it removes one level of indentation in almost the whole class, which is kind of nice.

FYI, this is one of the "object calisthenics" rules.

Add isSubmitting property to piwik-ajax-form directive and make sure child elements can access scope.

Added angular directive that automates logic for AJAX forms.

Maintain accidental default behavior due to old typo bug (return empty array() when config section doesn't exist in INI config).

Fixing bug caused by typo in core/Config.php (caused non-existant config sections to contain old superuser bridge info on first access).

Fix for #5300: prevent email reports from being sent twice

Fixes the UI tests (admin_privacy_settings)

There was a notification that wasn't hidden on page load (as it should have been). This is because the JS code that hides it is in jQuery, and is run on the page load. But the message to hide is inside an Angular directive which is being "rendered" on page load.

So I suspect that when jQuery tries to hide the span, it doesn't exist in the DOM as the Angular directive hasn't generated it yet. Later, when we click on the checkbox, jQuery can find the span and hide it correctly.

This fix is not really pretty but messing with AngularJS from jQuery is not really simple :/

Fixes #4616: Show only the first characters of tokens in the admin

Tokens are shown in full only when we click on it.

Fixes #6373 When Real time segments are disabled, then we allow "view" users to create "Pre-processed" segments. By default though only admin users can create pre-processed segments.

[automatic translation update] Updated 278 strings in 10 languages (pt, cs, da, de, el, es, et, it, pl, ja)