Spelling suggestions doesn't work with case insensitive

when i use Keywords with un upcase letter Spelling suggestions doesn't work because solr will index lower case word

function apachesolr_multilingual_get_search_suggestions use
$keyword = $query->getParam('q'); it must be change $keyword to lower case here
because $word is always lower case
$replacements[$word] = $value->suggestion[0];
i suggest this patch to fix this issue