marco: update to 1.26.2

Change log:

### marco 1.26.2

  * update translations
  * Show correct window title when owned by superuser. Issue #749
  * Test if XResQueryClientIds() is available before using it.
  * Needed for X2Go as it does not have XRES 1.2 extension.
  * Test Xres 1.2 is present
  * test return value from XResQueryClientIds()

(gutteridge)