[LyX/master] Extend tab context menu features

[Daniel]

On 2024-06-25 17:38, Pavel Sanda wrote:
> On Sat, Jun 01, 2024 at 05:25:19PM +0000, Jean-Marc Lasgouttes wrote:
>> +	popup.addAction(qt_("Open Enclosing &Folder"), this, SLOT(openEnclosingFolder()));
> 
> In all other strings we use "directory", not folder. Should I fix only master or branch as well?
> 
> Pavel

FYI, on macOS and Windows "Folder" seems to be universally used. While 
on Linux, "Directory" seems to be still in use too (Gnome? but not KDE?).

Daniel