• Set the size of the libm17n mconv conversion buffer correctly
  Resolves: rhbz#1335021 - Vowel part is not getting added into preedit
  See: https://bugzilla.redhat.com/show_bug.cgi?id=1335021
• Do not colourize the preëdit dark blue, that is unreadable on dark backgrounds
  Resolves: rhbz#1335201 - Preëdit should not be coloured dark blue,
  that is hard to read on dark backgrounds
  See: https://bugzilla.redhat.com/show_bug.cgi?id=1335201