Add command title to Custom Actions

Submitted by Yousuf Philips `@philipzae`

Assigned to Xfce Bug Triage

Created attachment 9519 how it looks in firefox

When using custom commands in collapsed mode, it would be good to have indication of which custom command will be run before pressing enter.

For example if i typed '!w xubuntu' which will open in wikipedia, it would be good to show below the input field 'Wikipedia: xubuntu'.

Attachment 9519, "how it looks in firefox":

Version: Unspecified