WordPress core doesn’t have control over the language translation of WordPress themes and plugins.
Many WordPress themes and plugins offer language translations that use a po file.
This is a file generated by a program which maps parts of a theme/plugin to the po file it’s described at http://codex.wordpress.org/Translating_WordPress and it’s a PAIN to use and manage: make a small change to a plugin/theme and the po files needs rebuilding!
Stallion Responsive doesn’t use this option, Stallion includes a custom built language translation feature which makes creating a translation on the fly really easy.
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