Update to 1.5.37
    
    - Update translations from Zanata (pl and uk updated)
    - Make “Add direct input” option work correctly when
      “Remember last preedit input method” option is off
    - Fix test case for Korean
    - Rewrite setup UI completely in Python, without using Glade
    - Fix format string in debug message when a dictionary .aff file has no encoding
      (Resolves: rhbz#1575659)
    - Return False in read_training_data_from_file() if file cannot be opened