Czech localization makes the video display go black
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When having the video output set to the "gl" (all variants) and audio output set to a user defined alsa device, e.g. "alsa:device=earspeakers" there's no image during playing a movie, only the black screen. Strangely enough when runing SMPlayer with "LANG=en_US" environment variable to change from my system default "cs_CZ" localization the problem doesn't occur.
mplayer log