Overview of changes in gcalctool 4.3.51

* Version for GNOME 2.6 (FINAL) call for tarballs. Includes:
  - new locales for pa, en_GB, bg and ga.
  - localized online user documentation from the Sun translation team.
    for de, es, fr, it, ja, ko, sv, zh_CN, zh_HK and zh_TW.

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