The priority in Basic Search in the Issue Navigator can only be found by the translation of the language pack used by the current user. The same status in the Advanced search (or JQL), can only be found by the original value.

Steps to reproduce

1. Set the Default Language of JIRA to English
2. Set the user language of JIRA to Spanish
3. Create a priority Blocker
4. Through the Translate Priority option, add a translation to Spanish Supone un impedimento
5. Generate issues in Priority Supone un impedimento

Expected result

When searching for issues through the Advanced Search in the issue navigator (or other searches using JQL) in Priority Supone un impediment the previously generated issues will be found

Actual result

No issues can be found in Priority Supone un impediment, it throws an error message 

El valor 'Supone un impedimen' no existe para el campo 'priority'.  

However, issues can be found in the Priority Blocker.

Workaround

The workaround at the moment is a Basic search instead of an Advanced search. Screenshot attached.