Jordi Llach Fernandez opened SPR-13209 and commented
ResourceBundleThemeSource is responsible for creating a MessageSource, which in fact is a ResourceBundleMessageSource, the last one can be configured to avoid using the fallback to system locale mechanism by setting fallbackToSystemLocale to false.
I think it would be useful to make this property visible to ResourceBundleThemeSource in order to create MessageSource s system locale aware or not.
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Referenced from: commits c7fef87