en to en_AU translation catalogue (4 entries)

en: Plugins
en_AU: Plug-ins

en: Finished downloading new star catalogs!
    Restart Stellarium to display them.
en_AU: Finished downloading new star catalogues!
    Restart Stellarium to display them.

en: Error downloading %1:
    File is corrupted.
en_AU: Error downloading %1:
    File is corrupt.

en: Star catalog updates
en_AU: Star catalogue updates
