Oliver Tappe eaa5e0936d Fix #8452 (app's crashing for non-existent system catalog)
* make the system catalog a BCatalog instead of a BCatalogAddOn*,
  such that using a non-existing system catalog won't crash but
  simply return the untranslated string instead
* rename MutableLocaleRoster::GetSystemCatalog() to LoadSystemCatalog()
  and adjust it to use BCatalog::SetTo() in order to replace the
  data used by the given catalog
* adjust all users of gSystemCatalog accordingly
2012-04-14 17:58:58 +02:00
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