BUG: Search is case sensitive

[hero101]

Describe the bug "Capitals are defining search results: when I search for 'denise', I don't get any search results for contributors. When I search with capital for 'Denise', I do get the results. "

To Reproduce Steps to reproduce the behavior:

1. Go to Home page
2. Click on Search
3. Search for 'denise'
4. No results for Contributor Denise Larsson
5. Search for 'Denise'
6. Results are found Contributor for Denise Larsson

Expected behavior Search is not case sensitive