searchConversation: Ignore diacritics

Please allow searching for diacritics letters, eg the French Ê with e?

Thank you

• https://zombiekeys.quickfolders.org/
• https://review.jami.net/c/jami-daemon/+/22809

it's a regex search so you can do ".tudiant" to match "etudiant" or "étudiant" (or even "Etudiant"/"Étudiant")

changed title from conversation: add diacritics flag on searchConversation to searchConversation: Ignore diacritics

Perhaps after Q1 2023 there can be code pointers that can be used from https://github.com/meilisearch/meilisearch/issues/3092#issuecomment-1325250475

changed the description

regex can be used. And are more powerfull

added UI/UX label

moved from jami-client-qt#895 (moved)