I found a workaround to invert the two finger scrolling behavior.
It is enough to add a file .Xmodmap in the home dir with the following content:

$ cat .Xmodmap 
pointer = 1 2 3 5 4 6 7 8 9 10

(note that the forth and fifth numbers are swapped)

This invert the two finger scrolling direction, but unfortunately also
the direction of scrolling of the wheel of an external mouse, if used...

Anyway, for those using only the touchpad I think it is a good,
temporary compromise :)

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https://bugs.launchpad.net/bugs/1590590

Title:
  Touchpad not recognized on Dell Latitude E7470 Ultrabook

Status in linux package in Ubuntu:
  Triaged
Status in xserver-xorg-input-synaptics package in Ubuntu:
  Confirmed

Bug description:
  Expected: Touchpad settings available in Mouse & Touchpad Settings
  dialog

  Actual result: Touchpad settings missing entirely

  
  Details:
  The touchpad on my Dell Ultrabook (Latitude E7470) functions mostly. 

  The settings for the touchpad are not available at all in the Mouse
  and Touchpad settings (see http://i.imgur.com/YRGiOrj.png).

  Two-finger scrolling works as expected except it's using "Natural
  Scrolling" by default and there is no way to change it.

  xinput list does not display a touchpad at all:

  ⎡ Virtual core pointer                        id=2    [master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer                      id=4    [slave  pointer 
 (2)]
  ⎜   ↳ ELAN Touchscreen                                id=11   [slave  pointer 
 (2)]
  ⎜   ↳ ImPS/2 Generic Wheel Mouse                      id=13   [slave  pointer 
 (2)]
  ⎣ Virtual core keyboard                       id=3    [master keyboard (2)]
      ↳ Virtual core XTEST keyboard                     id=5    [slave  
keyboard (3)]
      ↳ Power Button                                    id=6    [slave  
keyboard (3)]
      ↳ Video Bus                                       id=7    [slave  
keyboard (3)]
      ↳ Power Button                                    id=8    [slave  
keyboard (3)]
      ↳ Sleep Button                                    id=9    [slave  
keyboard (3)]
      ↳ Integrated_Webcam_FHD                           id=10   [slave  
keyboard (3)]
      ↳ AT Translated Set 2 keyboard                    id=12   [slave  
keyboard (3)]
      ↳ Dell WMI hotkeys                                id=14   [slave  
keyboard (3)]
      ↳ DELL Wireless hotkeys                           id=15   [slave  
keyboard (3)]

  
  /proc/bus/input/devices lists the device as a "Generic Wheel Mouse"

  Output of `lsb_release -rd`:
  Description:  Ubuntu 16.04 LTS
  Release:      16.04

  xserver-xorg-input-synaptics version information:
  xserver-xorg-input-synaptics:
    Installed: 1.8.2-1ubuntu3
    Candidate: 1.8.2-1ubuntu3
    Version table:
   *** 1.8.2-1ubuntu3 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

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