Change text for "time in queue"

"Time in queue" is one of the variables shown for worklow operation
details. However, the name is misleading, as this does not
refer to the time the operation (or the job representing it) was waiting
before starting. Instead, it represents the time all the jobs the
operation has spawned were waiting.
Which is why "time in queue" so often has the value "0ms", as many
workflow operations simply don't spawn an jobs.

This patch attempts to make this more clear by changing "time in
queue" to "total subjobs time in queue". Suggestions are welcome.

Author: Arnei

src/i18n/org/opencastproject/adminui/languages/lang-en_US.json

@@ -1057,7 +1057,7 @@
 						"DESCRIPTION": "Description",
 						"EXECUTION_HOST": "Execution Host",
 						"JOB": "Job",
-						"TIME_IN_QUEUE": "Time in Queue",
+						"TIME_IN_QUEUE": "Total subjobs time in queue",
 						"STARTED": "Started",
 						"FINISHED": "Finished",
 						"RETRY_STRATEGY": "Retry Strategy",