[br] - use SRX tokenization for Breton.
     - disambiguate "e" in abbreviation "d.l.e" (= da lavaret eo)
       to fix false positive as in:
       "d.l.e desket war ar brezhoneg"
       (thanks to Stefan Carpentier for reporting the false positive)
      - changed fule FAZ_KEMM to detect spurious mutation in:
       *d.l.e tesket war ar brezhoneg* -> "d.l.e desket war ar brezhoneg"