Due to the way certain Java classes handle internationalization, some action words are dependent on the locale set by the JVM (which uses the system default locale).

For example, if the default system locale is set to French but JIRA's default language is set to English some words will still appear in French. Fortunately you can set the following properties to over-ride the default locale used by the JVM:

-Duser.language=en -Duser.country=US

See this page for a sample of the supported languages and country codes