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Here's a guide to customising the language: Customize the Web Help Desk GUI language and labels - SolarWinds Worldwide, LLC. Help and Support
From there, note that Java requires properties files to be in Latin-1 or escaped Unicode format, in which Unicode characters are represented by Unicode escape sequences. You can use the Java tool "native2ascii" to convert native-encoded files to to this format. native2ascii is located at <WebHelpDesk>/bin/native2ascii
Note that UTF-8 encoding does not use these Unicode escape sequences. You must use native2ascii to convert UTF-8 encoded files.