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We are trying to resolve the missing integration with the plugin english-wp-admin.
That plugin (and possibly others) are forcing the interface language in the backend to be English. However, when it does, then the language-fallback plugin still loads the second language as a fallback, which in turn causes the administrative dashboard to not appear in English.
In order to resolve this, the english-wp-admin plugin needs to unregister the locale filter of language-fallback in the right conditions. However, it is not able to do that currently, because the language-fallback plugin does not retain the class instance (object) that was used to register the filter.