[macOS] Fix context menu entries refreshing

The context menu entries have default names set in the swift code of the FinderSync extension. Those values are updated from the application at startup or on lang change.

It appears that even if values are correctly sent to the extension, the menu still displays the old names.

Some reading: https://cocoa-dev.apple.narkive.com/uXPz3TSp/finder-sync-extension-menu-limitations

I laready yried to restart the extension after having sent new names, but it has no effect.