With recent changes to Language selection, https://developer.blender.org/D7210, we are deprecating the "Translate" (USER_DOTRANSLATE) flag and favoring a default language of English (id=1), rather than Auto (id=0).
We dealt with the situation of users having old preferences in versioning_userdef.c but I forgot to address the situation of preferences not existing at all. In that case, of a brand new user, we want the language to start at English, not Auto. This patch makes that change by setting this value in userdef_default.c