GtkFileChooser: button create folder not correctly labelled for accessiblity
Steps to reproduce
- Run the Orca screen reader
- Open the File Chooser from a text editor, for example Pluma
- Tab until focus the icon to create a new folder
Orca announces "menu" instead of "create folder icon" so a blind user couldn't be aware of the icon.
Orca should announce "create folder"
Orca doesn't present tool-tip to the user because tool-tip is a description. See explanation of the Orca developper: https://mail.gnome.org/archives/orca-list/2018-March/msg00076.html