issue 1965: search support Latin Accent and other unicode #6475

Job	Run time
Tests (mysql, rails test test/unit)	26m 48s
Tests (mysql, rails test test/functional)	34m 41s
Tests (mysql, rails test test/integration)	17m 53s
Tests (mysql, rspec spec)	3m 23s
Tests (mysql, rake assets:precompile)	3m 49s
Tests (mysql, rake db:setup)	3m 47s
Tests (mysql, rake db:migrate)	3m 36s
Tests (mysql, rake seek:upgrade)	3m 37s
Tests (sqlite3, rails test test/unit)	20m 43s
	1h 58m 17s

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