All of Atlassian's translations are user generated and there is certainly opportunities for you to assist with that. You can read about joining the tranlsation effort here: https://confluence.atlassian.com/display/TRANS/Atlassian+Translations
You might also find that the InProduct Translation plugin suits your needs whilst the language pack is being upgraded, you can check it out here: https://marketplace.atlassian.com/plugins/com.atlassian.translations.jira.inproduct
All the best,
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