* Added missing tooltips for existing buttons for list management (add line,
    remove line, move line, clone line)
  * Shortened existing tooltip texts to a minimum
  * Fixed incorrect tooltip texts
  * Changed order of buttons to 1. move item, 2. delete item, 3. add item, 4.
    clone item
  * Changed tooltips "click to toggle enable/disable rule" to "disable rule" and
    "enable rule" corresponding to the current state, respectively.