Added support for accented characters

[FrivalszkyP]

I added an iconv conversion to every matched string so that accented characters are transliterated to their unaccented versions before searching. This is simple multilanguage support and this is how Google works, for example. For example if you search for "perez" it will return results containing "pérez" too.

I don't think it is necessary for this to be a configurable option because I can't really think of a situation where this would not come in handy.

[flaviocopes]

I haven't tested it yet, but wonder how this is going to play with the fact Grav can handle locales different than en_US https://github.com/getgrav/grav/blob/develop/system/src/Grav/Common/Grav.php#L137-L150

[mahagr]

Maybe there's a need to whitelist languages where this is allowed. This only works with languages that use latin characters.

[FrivalszkyP]

Right, right. It should be tested with non-latin alphabets.

[FrivalszkyP]

I added a config option so that you can add this to your simplesearch.yaml file:

ignore_accented_characters: true

This way we don't have to maintain a whitelist of allowed languages etc. but the site administrator can decide if they want this feature or not.

I also refactored the code a little bit so it is more maintainable but it also comes with a little bit of overhead. I think it's acceptable.

[flaviocopes]

Looks good, the only thing is, add an entry for the option in the blueprints.yaml file, so it's configurable from the Admin interface

[FrivalszkyP]

Added the changes, if you like it, please do a squash & merge if possible!

[flaviocopes]

Merged, thanks!

[A----]

The en_US locale has to be installed for this feature to work, or it wont be able to properly transliterate characters: string(5) "p?rez"

(Also, this option could be documentated in the README.md.)

[flaviocopes]

Documented