GitLab

Detail:

  * More minor message alterations: removed "Network Computer" and replaced
    this with "system", since this is generic.  Also brought the
    other resources up-to-date by including messages missing from the
    non-UK resources.

Admin:

  * Checked but untested.  (These additional changes made after having
    discovered the phrase "Network Computer" within "rlib" during a
    search across the whole of the Lazarus sources; hopefully, I have
    found them all this time!)

Version 5.01. Tagged as 'RISC_OSLib-5_01'