fix multilingual remaining issues

[syphax-bouazzouni]

Context

BioPortal has done some work recently to fix some remaining issues in the Multilingual features

Changes

• Multilingual prefLabels ncbo/ontologies_linked_data#220 and fix:Multilingual preflabels ncbo/ontologies_linked_data#221 -> Fix: issue when generating multilingual missing labels ontoportal-lirmm/ontologies_linked_data#164
• small refactoring for the multilingual fixes ncbo/goo#160 -> Feature: small refactoring to add portal_language helper ontoportal-lirmm/goo#63
• fix:Multilingual preflabels ncbo/ontologies_api#169 -> Fix: multilingual generated missing labels issue  ontoportal-lirmm/ontologies_api#101

Will fix

• Probleme d'affichage de langue pour LEXEAU ontoportal-lirmm/bioportal_web_ui#656
• False EN prefLabel generated when there is no english label for a concept #515

[syphax-bouazzouni]

Code merged, we will wait until the end of the federation phase, to deploy it and do the test to be sure they fix our local issues.