Wrong fallback language

[Sobotka Martin]

Hi,

I'm trying to configure my IdP (version 3.3.1) to use the correct locale (translation). There should be three ways (scenarios) to set the locale:
-  URL Parameter "Lang"
- Cookie with name "locale"
- And Accept-Language Header
The default and fallback language should be English.

All these three scenarios are working if I you use a known locale, in my case "en", "de" or "zh". If I choose an unknown locale, e.g. "es", the login page will be displayed in German instead of English.

My configuration looks like as follows:
File "idp.properties":
	[...]
	idp.ui.fallbackLanguages=en
	[...]
File "services.xml":
	[...]
	<util:list id="shibboleth.MessageSourceResources">
        		<value>%{idp.home}/messages/messages</value>
       		<value>%{idp.home}/system/messages/messages</value>
	</util:list>
	[...]
File "mvc-beans.xml":
	[...]
	<mvc:interceptors>
		<bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
			<property name="paramName" value="Lang"/>
			<property name="languageTagCompliant" value="true"/>
			<property name="ignoreInvalidLocale" value="true"/>
		</bean>
	</mvc:interceptors>
	<bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
		<property name="cookieName" value="locale"/>
		<property name="languageTagCompliant" value="true"/>
	</bean>
	[...]
Files in directory "messages/":
	- messages_en.properties
	- messages_de.properties
	- messages_zh.properties
(I've also renamed messages_en.properties to messages.properties without success)

Do you have any tips or hints to change the fallback language back to English?

Thanks in advance,
Martin