Add rate setting for major outage

Major outage criteria depends on required service level.
Default value keeps 50% because it had been fixed to 50%.

resources/lang/en/forms.php

@@ -154,6 +154,7 @@ return [
             'about-this-page'                       => 'About this page',
             'days-of-incidents'                     => 'How many days of incidents to show?',
             'time_before_refresh'                   => 'Status page refresh rate (in seconds)',
+            'major_outage_rate'                     => 'Major outage threshold (in %)',
             'banner'                                => 'Banner Image',
             'banner-help'                           => "It's recommended that you upload files no bigger than 930px wide",
             'subscribers'                           => 'Allow people to signup to email notifications?',

resources/views/dashboard/settings/app-setup.blade.php

@@ -57,6 +57,14 @@
                                 </div>
                             </div>
                         </div>
+                        <div class="row">
+                            <div class="col-xs-12">
+                                <div class="form-group">
+                                    <label>{{ trans('forms.settings.app-setup.major_outage_rate') }}</label>
+                                    <input type="number" name="major_outage_rate" class="form-control" value="{{ Config::get('setting.major_outage_rate', 50) }}" placeholder="{{ trans('forms.settings.app-setup.major_outage_rate') }}">
+                                </div>
+                            </div>
+                        </div>
                         <div class="row">
                             <div class="col-xs-12">
                                 <div class="checkbox">