Search: Highlight texts that match searched text

Please test on both the Clean and the Boost theme. Test message and user searching Log in as admin Create user with a name  "John Snow" and a user with name "Martha Smith" Send John a message Send Martha Smith a message Navigate back to the main messaging window Search for words used in the messages Verify the search word is highlighted in the search results Search for user John Snow using the full name or only a part of the name Verify the username is highlighted in the search results Test highlighting after load more messages / users Log in as admin Send John Snow 60 very short messages with text "ee" Navigate back to the main messaging window Search for the words "ee" Verify  you see a load more link when scrolling down the message results Verify that after clicking the load more link the remainder results are highlighted as well.