Searching in contacts should not take accents into account

[esope]

🚀 Feature request: Searching in contacts should not take accents into account

📝 Description

Suppose you have a contact with first name "André" and last name "Trémieux".
If you use the search feature, and type "Andre" or "Tremieux" you will not find your contact.
This makes searching for contacts quite difficult in languages where accented letters are widely used.

📝 Describe the solution you'd like

Having the search feature ignore the accented letters (i.e., consider that "é" and "e" are the same for example) would be a great plus!

📝 Describe alternatives you've considered

Do not use accented letters at all... but that would be a shame.

[pholat]

It's plausible, but please do not expect us to implement it right away :)

Searches are based on sqlite3 matches in db. Therefore for this case, we would have to:

1. add a list of accents for each language
2. use regexp instead of string match in db

Reported for our internal reference: https://appnroll.atlassian.net/browse/MOS-414