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Summary

As part of a special multi-user plugin, we wanted to add a search filter for a username.

There are some issues with that, currently this is not possible without changing the core:

• The filter "html_select" can be used to add an option, but this needs to be done in the generated HTML for the select box
  => it would be better to add a hook to include a new option before creating the HTML
• The "search_in" parameter can be changed in the filter "admin_view_search_in", which seems to be OK
• But then you get an error, because the new filter has no translation in "params_translations" in AdminParams..php
  => there is no filter or hook to add newe translations, so this would require core changes for now

Motivation

We want to filter for a specific username in our multi-user plugin

Describe the solution

Add a new filter before "html_select" where plugins can change the list of options
Add a new filter to add a new translation for the search filter.