You can translate the name and description of any custom field that you create using Jira's pre-installed language packs. To translate a field:

  1. Select > Issues.
  2. Under FIELDS, click Custom fields.
  3. Find the custom field you want to translate and click  > Translation options. 
  4. Choose the language pack that this custom field translation will belong to (e.g. French), and enter the translated strings for the field name and description.
  5. Click Update when you're done.