[4.1] Simplify notification labels

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#36271 Here are the upstream changes:

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diff --git a/administrator/language/en-GB/plg_system_tasknotification.ini b/administrator/language/en-GB/plg_system_tasknotification.ini
index 33e6f6bbcf83..d94cfe5d028f 100644
--- a/administrator/language/en-GB/plg_system_tasknotification.ini
+++ b/administrator/language/en-GB/plg_system_tasknotification.ini
@@ -8,10 +8,10 @@ PLG_SYSTEM_TASK_NOTIFICATION_FAILURE_MAIL_BODY="Hello,\n\n\nPlanned execution of
 PLG_SYSTEM_TASK_NOTIFICATION_FAILURE_MAIL_SUBJECT="Task Failure"
 PLG_SYSTEM_TASK_NOTIFICATION_FATAL_MAIL_BODY="Hello,\n\nPlanned execution of Scheduler Task#{TASK_ID}, {TASK_TITLE}, recovered from a fatal failure.\n\nThis could mean that the task execution exhausted the system resources or the restrictions from the PHP INI.\n\nPlease visit the Joomla! backend for more information."
 PLG_SYSTEM_TASK_NOTIFICATION_FATAL_MAIL_SUBJECT="Task Recover from Fatal Failure"
-PLG_SYSTEM_TASK_NOTIFICATION_LABEL_FAILURE_MAIL_TOGGLE="Notifications on Task Failure"
-PLG_SYSTEM_TASK_NOTIFICATION_LABEL_FATAL_FAILURE_MAIL_TOGGLE="Notifications on Fatal Failures/Crashes (Recommended)"
-PLG_SYSTEM_TASK_NOTIFICATION_LABEL_ORPHANED_TASK_MAIL_TOGGLE="Notifications on Orphaned Tasks (Recommended)"
-PLG_SYSTEM_TASK_NOTIFICATION_LABEL_SUCCESS_MAIL_TOGGLE="Notifications on Task Success"
+PLG_SYSTEM_TASK_NOTIFICATION_LABEL_FAILURE_MAIL_TOGGLE="Task Failure"
+PLG_SYSTEM_TASK_NOTIFICATION_LABEL_FATAL_FAILURE_MAIL_TOGGLE="Fatal Failures/Crashes (Recommended)"
+PLG_SYSTEM_TASK_NOTIFICATION_LABEL_ORPHANED_TASK_MAIL_TOGGLE="Orphaned Tasks (Recommended)"
+PLG_SYSTEM_TASK_NOTIFICATION_LABEL_SUCCESS_MAIL_TOGGLE="Task Success"
 PLG_SYSTEM_TASK_NOTIFICATION_NO_MAIL_SENT="Could not send task notification to any user. This either means that mailer is not set up properly or no user with system emails enabled, com_scheduler `core.manage` privilege exists."
 PLG_SYSTEM_TASK_NOTIFICATION_ORPHAN_MAIL_BODY="Hello,\n\nScheduled Task#{TASK_ID}, {TASK_TITLE}, has been orphaned. This likely means that the provider plugin was removed or disabled from your Joomla! installation.\n\nPlease visit the Joomla! backend to investigate."
 PLG_SYSTEM_TASK_NOTIFICATION_ORPHAN_MAIL_SUBJECT="New Orphaned Task"