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1. Log into JIRA as user that is used to access OTRS.
2. From your user menu, select Profile.
   
3. Search for "Language" in the "Preferences" section.
   
4. If you need to change your default language, do the following:
   1. Click the pencil icon at the top of the "Preferences" section.
      The "Update User Preferences" dialog appears.
      
   2. Select English (United States) or English (UK) from the "Language" menu.
   3. Click Update.