In search result : set search string in bold inside results

[Rebolon]

The search component display a list of result, but it doesn't set in strong/bold the part of the list where the searched term is.
sample : you search "victo"
it can display a cite with the word "victoire" but also cites where the author is "Victor Hugo"

We may add a strong tag around the words that contains the searched string (take care, with could search for Victor Hugo so both word should be in strong)