Two different threads ( = two different user queries) can call the request
function in a row and then the response function. The namespace will be same
since this is the same engine.
To keep exactly the same value ``base_url`` must be stored in params and then
retrieve using ``resp.search_params["base_url"]``.
Suggested-by: @dalf https://github.com/searxng/searxng/pull/862#discussion_r799324861
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
The language_support variable is set to True by default,
and set to False in only 5 engines.
Except the documentation and the /config URL, this variable is not used.
This commit remove the variable definition in the engines, and
set value according to supported_languages length: False when the length is 0,
True otherwise.
Close#2485
