It is a great app, however, if you have multiple keyboards in different languages (eg latin letters and korean/japanese/etc, it picks up the added language as default and displays the name of constellation in that language. If you have not mastered that language, basically, you are lost. There seems to be no option to change it in the app.
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Response from developer
Please do the following: Touch the settings (gear icon), turn on the "Activate name language setting" switch (the sixth switch from the bottom), touch "Set language of name", and touch the language you want to display.