* (bug 17146) Fix for UTF-8 and short word search for some possible MySQL configs

* (bug 17146) Fix for UTF-8 and short word search for some possible MySQL configs

Language::stripForSearch() was lowercasing input, but producing 'U8' for its unicode and short-word normalizations... but SearchUpdate::doUpdate() was running *that* through an additional strtolower() before actually saving to the database.
It's possible that some folks configurations were applying a case-sensitive search on the search table (?) which would make these not match up when actually searching. Going ahead and producing 'u8' right off will ensure these stay in sync.