I haven't found a direct way to get rid of that screen either. Hopefully that will be fixed in 3.9 as the roadmap mentions a fix for 'No need to display language when only one is installed [1]'. Not sure whether this concerns language selection screen or not but it looks promising.
Meanwhile you could a workaround: http://ez.no/community/forum/setup_design/language_of_content_creation_in_the_frontend_3_8/re_language_of_content_creation_in_the_fronten__8
Greetings from Luxembourg
Claudia
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