Fixed: Added Various Missing Translations

cleanup en.json of unused translates

Fixes #1397

Closes Sonarr PR # 4791 'Fixed: Better wording of MissingFromDisk'

frontend/src/System/Tasks/Queued/QueuedTasks.js

@@ -15,27 +15,27 @@ const columns = [
   },
   {
     name: 'commandName',
-    label: 'Name',
+    label: translate('Name'),
     isVisible: true
   },
   {
     name: 'queued',
-    label: 'Queued',
+    label: translate('Queued'),
     isVisible: true
   },
   {
     name: 'started',
-    label: 'Started',
+    label: translate('Started'),
     isVisible: true
   },
   {
     name: 'ended',
-    label: 'Ended',
+    label: translate('Ended'),
     isVisible: true
   },
   {
     name: 'duration',
-    label: 'Duration',
+    label: translate('Duration'),
     isVisible: true
   },
   {