remove diacritics (iso latin1 chars) from input query in cms search

wildcard pre/postfixing combined with stemming is not always possible to work correctly in Lucene. Currently the problem that when for example indexing the word 'Plattenbandförderer' (mind the ö accent) and then quering in the CMS you get:

'Plattenbandförd' DOES have a hit (cms does auto postfix wildcards)
'Plattenbandfö' DOES NOT have a hit wildcard postfix fails with accents)
'Plattenbandförde' DOES NOT have a hit wildcard postfix fails with accents)
Plattenbandförderer DOES have a hit

this is because we use an analyzer by default that removes diacritics. Hence, it is better to remove diacritics from the input query before doing a search with it

Also see https://issues.apache.org/jira/browse/JCR-3511