The Jira Plugin Language Enforcer allows you to control and constrain the language into which the issue description is written.
This can be highly useful for organizations that span multiple countries and cultures allowing to have a coherent project with all issues described in the same language.
The Language Enforcer plugin presents itself as a validator. It can be added as a validator between different states in the workflow you wish to control. Transitioning a Jira issue from a state to another will only work if the issue description is written in the language the validator was configured with between the two states.
In order to find out more how to configure a validator for your workflow please check the following page: Advanced workflow configuration