You only mean in the administration area? You could use an ftp program to delete the ru-RU.com_joomgallery.ini file in the folder administrator\language\ru-RU. Then the English language is used as fallback.
Thanks I found, translation into Russian was horrified (((
It would be better if you can improve the language files. Then we could take them into the downloads and all users would have something like this.
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