Feature: Make map_attribute support showing all languages - Support multi language search

[syphax-bouazzouni]

Context

Follow up of https://github.com/ontoportal-lirmm/goo/pull/41

This PR makes 'map_attributes` method handle the option showing all the languages; this method is used to map the unmapped values to the mapped ones (e.g skos:prefLabel to the model attribute prefLabel) and is used in the indexation process.

So making the method multilingual is mandatory and the first step to make the search/index multilingual.

Changes

• Change the getters show_all_languages argument from to include_languages (https://github.com/ontoportal-lirmm/goo/commit/5952f8708f64f0a28dcf2ae44c4d8e4610682448)
• Make the map_attributes method handle the option showing all the languages (https://github.com/ontoportal-lirmm/goo/commit/a81f12ca1d5d6cf7c4b7c30718ff6bd8e4a56aff)