tommcfarlin/WordPress-Plugin-Boilerplate — pull request #21 by leewillis77 (2013-01-30 20:25:33+00:00)
Title: A better way of loading language files

The patch attached means that users aren't restricted to placing translation files within the plugin's directory (Where they would be wiped out on plugin upgrade), but can also drop them under WP_LANG_DIR. A fuller description here:

http://www.geertdedeckere.be/article/loading-wordpress-language-files-the-right-way