FR #15314612 - Enable search on non accentuated chars

- update normalization step. Use a Normalizer for a string
decomposition to the NFD form and remove those diacritics with
a "\\p{InCombiningDiacriticalMarks}+" pattern.

See bug #15314612 Search - need to be able to search and have results
with non accentuated chars

Change-Id: Ifaf4cd2ca2fb712e1c6f5f5272f942dda99464e4