The splunk automatically detects user's browser's default language and uses it. You can use use a temporary solution of changing the web url as http://host:port/locale/.. However there is also another method of editing Splunk/Python-2.7/Lib/site-packages/splunk/appserver/mrsparkle/lib/i18n.py file on line 333 replacing (changing line 449 didn't help me) locale = "%s-%s" % (locale[0], locale[1]) if locale[1] else locale[0] with locale="en-GB" Save and restart splunk Splunk provides built-in support for these locales: de-DE en-GB en-US fr-FR it-IT ja-JP ko-KR zh-CN zh-TW ... View more