The search is accent sensitive

[NathanVss]

Feature Request

Is your feature request related to a problem or unsupported use case? Please describe.
During searching I found out that typing "é" does not match "e".

Describe the solution you'd like
We should inject all variant to a defined character, like:
"éèêë" -> "e"
"àä" -> "a"
This should be done at "index-time" and also at "search-time" in order for it to work easily.

And so on ...