Log Message:
Update to 1.5.4:

2012-4-3 meld 1.5.4
====================

  Fixes:

    * Slightly faster diff calculation (Piotr Piastucki)
    * Avoid too-tall commit dialogues (Nguyễn Hồng Quân)
    * Minor bug fixes and performance improvments (Kai Willadsen)

  Translation updates:

    * Alexander Shopov (bg)
    * Fran Diéguez (gl)
    * Kjartan Maraas (nb)
    * Kristjan SCHMIDT (eo)
    * Nguyễn Thái Ngọc Duy (vi)
    * Toshiharu Kudoh (ja)
    * Trương Ứng Minh (vi)
    * Мирослав Николић (sr) (sr@latin)