Update to 2.4.0
    
    - Update translations from zanata (de, es, fr, ja, pl, uk updated)
    - Add new command 'toggle_hide_input' to hide the preëdit, lookup table, and auxiliary text
    - Add an option to use preedit style only if lookup is enabled
    - Add an option to choose the style of underlining the preedit
    - Don’t try to record the first candidate when there is none
      after an automatic commit on focus out or reset
      (Resolves: rhbz#1659128)
    - Add an option in the setup tool to set the debug level
    - Move appearance related options to the new “Appearance” tab
    - Add settings for colour and other appearance stuff
    - Move “Dictionaries and input methods” Tab in the setup tool to the first position
    - Update the shortcut hints in the tooltips when keybindings change
    - Only show the label in the panel menus for emoji-mode and off-the-record-mode
    - Don’t show the shortcut hints in the menu labels, takes too much space there.
    - Update README because of the recent change to make keybindings configurable.