Refactors name and description edit.
Remove unused fields.
Check if channel can be edited.
Reset the edit flag when new object is selected.
Add method to check if the group is a system group.
Do not allow to edit a system group.
Do not allow to edit system groups (see #11075)
Reset edit description flag.
Fix indent
Merge pull request #1746 from jburel/edit-fields

Edit fields