Implements mechanism for choosing which sender (NotificationSender) will be used for sending particular notification with given type.
More about configuration of notifications you can find here.
Test for searching defects in localization files with JSON suffix. Test mostly compares names of messages, only difference is in singular and plural description. When the plural is recognized, it will check if CS and EN are in match despite different properties. CS messages are specified by number behind underscore and EN messages ends with word plural behind the underscore.