Code looks good to me, and it's working fine. It looks to me like a very specific use case, which also does not apply to Dutch accounting habits but it may be broader than just Spanish (you never know, right?) so I think having the module here is fine.
What bothers me a little is the module name. Yes, it extends the search but it does so in a very specific way. Would you consider to change the name to something like "account_account_wildcard_zero_search"?
Code looks good to me, and it's working fine. It looks to me like a very specific use case, which also does not apply to Dutch accounting habits but it may be broader than just Spanish (you never know, right?) so I think having the module here is fine.
What bothers me a little is the module name. Yes, it extends the search but it does so in a very specific way. Would you consider to change the name to something like "account_ account_ wildcard_ zero_search" ?