Exchange 2013 - OWA Spanish Language

I'm running into an issue with Exchange 2013 CU9 where OWA reports an error after logging in. This issue is present when the language is set to Spanish instead of the default en-us. Everything functions fine with language set to en-us. Has anyone run into this before?

Checking Language Setting.

Get-MailboxRegionalConfiguration -Identity testmailbox
Identity             Language        DateFormat TimeFormat TimeZone
--------             --------        ---------- ---------- --------
domain.com... es-ES_tradnl    dd/MM/yy   HH:mm      Mountain Standard Time

IE error... also present in chrome

Sorry, we can't get that information right now. Please try again later. If the problem continues, contact your helpdesk.

X-ClientId: YSA0 - CONU - SIGV - DJBKNSA
X-OWA-Error: ScriptLoadError;Failed to load script: https://owa.domain.com/owa/prem/15.0.1104.5/scripts/globalize/globalize.culture.es-419.js
X-OWA-Version: null
X-FEServer: CAL-EX13CA02
X-BEServer: undefined
Date: 7/9/2015 4:51:44 PM