update to 1.5.5
    
    - Pull translations form Zanata (de, pl, and uk updated because of
      the new “About” tab)
    - If “☑ Enable suggestions by Tab key” option is on, any preëdit
      change should hide the lookup table
    - Make showing of similar emoji work even if emoji preditions are off
    - Display whether emoji predictions are turned on in the auxiliary string
    - Add key and mouse bindings to toggle the emoji predictions
      (AltGr+F6 and Control+Mouse3 anywhere in the candidate list)
    - Add AltGr+F10 key binding to open the setup tool
    - Allow any amount of white space and '_' characters to seperate words
      in an emoji query string
    - Add an “About” tab to the setup tool and put links to home page and
      online documentation there.
    - Update README with latest key binding and mouse binding documentation