FileChooser: Properly handle mnemonics in 'accept_label'
The FileChooser portal doc  for 'accept_label' says: > accept_label s > > The label for the accept button. Mnemonic underlines are allowed. Since Qt does not use underscores/underlines, but the ampersand character ('&') for mnemonics, convert the retrieved text accordingly, to make the mnemonic applied at the correct position and preserve literal '&'s.  https://flatpak.github.io/xdg-desktop-portal/portal-docs.html#gdbus-org.freedesktop.impl.portal.FileChooser BUG: 422340
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