The user_agent attribute of the Flask request object is an instance of
the werkzeug.user_agent.UserAgent class.
This will fix the following error of the self_info plugin:
> ERROR:searx.plugins.self_info: Exception while calling post_search
> Traceback (most recent call last):
> File "searx/plugins/__init__.py", line 203, in call
> ret = getattr(plugin, plugin_type)(*args, **kwargs)
> File "searx/plugins/self_info.py", line 31, in post_search
> search.result_container.answers['user-agent'] = {'answer': gettext('Your user-agent is: ') + ua}
> TypeError: can only concatenate str (not "UserAgent") to str
We do not want to show the user-agent information from the duckduckgo
zero click info. This is the user-agent used by searxng and not the
user-agent used by the user.
This was already done for the IP address in:
0fb3f0e4ae
Alexander SulfrianandBnyro
