[mod] replace engines_languages.json by engines_traits.json

Implementations of the *traits* of the engines.

Engine's traits are fetched from the origin engine and stored in a JSON file in
the *data folder*.  Most often traits are languages and region codes and their
mapping from SearXNG's representation to the representation in the origin search
engine.

To load traits from the persistence::

    searx.enginelib.traits.EngineTraitsMap.from_data()

For new traits new properties can be added to the class::

    searx.enginelib.traits.EngineTraits

.. hint::

   Implementation is downward compatible to the deprecated *supported_languages
   method* from the vintage implementation.

   The vintage code is tagged as *deprecated* an can be removed when all engines
   has been ported to the *traits method*.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/search/processors/online.py

@@ -51,6 +51,9 @@ class OnlineProcessor(EngineProcessor):
         super().initialize()
 
     def get_params(self, search_query, engine_category):
+        """Returns a set of :ref:`request params <engine request online>` or ``None``
+        if request is not supported.
+        """
         params = super().get_params(search_query, engine_category)
         if params is None:
             return None