[5.1] Workflows missing strings

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#42390 Here are the upstream changes:

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diff --git a/administrator/language/en-GB/com_workflow.ini b/administrator/language/en-GB/com_workflow.ini
index f5af1618b4e1..6b5d01f1fcfa 100644
--- a/administrator/language/en-GB/com_workflow.ini
+++ b/administrator/language/en-GB/com_workflow.ini
@@ -13,6 +13,7 @@ COM_WORKFLOW_DEFAULT="Default"
 COM_WORKFLOW_DESCRIPTION="Description"
 COM_WORKFLOW_DISABLE_DEFAULT="The default status cannot be changed."
 COM_WORKFLOW_ERROR_EXTENSION_NOT_SET="Extension not set."
+COM_WORKFLOW_ERROR_WORKFLOW_ID_NOT_SET="Workflow ID not set."
 COM_WORKFLOW_FIELD_IS_DEFAULT_LABEL="Default"
 COM_WORKFLOW_FIELD_NAME_LABEL="Name"
 COM_WORKFLOW_FILTER_SEARCH_DESC="Search in title and description."
@@ -34,6 +35,7 @@ COM_WORKFLOW_MSG_DELETE_WORKFLOW_IS_ASSIGNED="This workflow is in use by the com
 COM_WORKFLOW_MSG_DISABLE_DEFAULT="The default item has to stay published."
 COM_WORKFLOW_MSG_WORKFLOWS_DELETE_ERROR="There was a problem while deleting the item: %s"
 COM_WORKFLOW_NAME="Name"
+COM_WORKFLOW_NO_ITEM_SELECTED="No workflow selected."
 COM_WORKFLOW_N_ITEMS_CHECKED_IN="%d workflows checked in."
 COM_WORKFLOW_N_ITEMS_CHECKED_IN_1="Workflow checked in."
 COM_WORKFLOW_N_ITEMS_DELETED="%d workflows deleted."