Feature: Multilingual support - Add request language middleware

[syphax-bouazzouni]

Require

• Feature: Multilingual Support - Add search and languages serialization ontologies_linked_data#199

Context

This PR adds a middleware request_lang that will save for each request the parameter lang or language if set, as a global variable that will filter the values by it.

In addition, it updates the search helper, to add the selected language as a suffix of the SOLR requests, to search by the selected language only.

Changes

• Add again SOLR config file as changed for the multilingual support (75b05fe)
• Add request lang middleware to save as a global variable the request parameter "lang" or "language"(9435c7e)
• Update the search helper to add as a suffix the selected language (f7eaf98)
• Refactor test to be faster by doing the indexation only if needed (b5360d2)
• Add multilingual search unit tests (84f079e)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.28%. Comparing base (f439e21) to head (88973e9).

❗ Current head 88973e9 differs from pull request most recent head 2a675bb. Consider uploading reports for the commit 2a675bb to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #148      +/-   ##
===========================================
+ Coverage    73.13%   73.28%   +0.15%     
===========================================
  Files           52       53       +1     
  Lines         2903     2916      +13     
===========================================
+ Hits          2123     2137      +14     
+ Misses         780      779       -1     

Flag	Coverage Δ
unittests	73.28% <100.00%> (+0.15%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[alexskr]

I understand why the Solr schema was added to the ontologies_api project in this PR; it eliminates the need to keep the ontoportal/solr-ut image synchronized when schema changes occur. A more elegant solution could be implemented to maintain schema synchronization between ontologies_api and ontologies_linked_data, but this requirement will disappear after the schemaless Solr feature is implemented. At that point, the Solr configuration could be removed from ontologies_api.