Default search engines list can’t be customized per locale/country

This is an enhancement request rather than a real bug.

Since version 0.23+15.04.20150515-0ubuntu1, webbrowser-app comes with a default list of search engines that are installed system-wide, and that can be supplemented/overridden by locally installed OpenSearch description files.

This list is global, thus for a search engine to be part of it it has to adapt its search results to the user’s locale.
It might be desirable to have per-country/per-locale lists of search engines, rather than just a global one. There could be a fallback list for locales which don’t specify a custom list.

See e.g. what chromium does: https://code.google.com/p/chromium/codesearch#chromium/src/components/search_engines/template_url_prepopulate_data.cc