Crowdin - Localize your product in a seamless way
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
POEditor - The translation and localization management platform that's easy to use *and* affordable!
AIMP - AIMP : Free Audio Player : Официальный сайт программы
Lokalise - Localization tool for software developers. Web-based collaborative multi-platform editor, API/CLI, numerous plugins, iOS and Android SDK.
foobar2000 - An advanced freeware audio player for the Windows platform.