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Words with UTF-8 characters are wrongly detected in indexer_ backends.
UTF-8 characters splits words now.

Original in indexer_xapian.py:
for match in re.finditer(r'\b\w{2,25}\b', text.upper()):
  word = match.group(0)

OK:
for match in re.finditer(r'\b\w{2,25}\b', unicode(text, "utf-8","replace").upper(), re.UNICODE):
  word = match.group(0).encode("utf-8", "replace")