Recently I have experienced that locus switch languages. Not always the whole locus, but parts of it.
I use Locus in Norwegian language, but suddenly is parts of the app in English. Most annoying is that if it happens during the navigation, because then TTS ends to work, or it starts to speak English in a Norwegian way. (It is almost incomprehensible).
I've tried to figure out what triggers this bug, but it is unfortunately not that easy. It appears that it came after the latest version.