How to apply a patch to a Drupal module

The module localization client, originally developed for Drupal 6, needs a patch to the Drupal core module, locale (note that while locale is core it is also optional and disabled by default).

In this case the patch lives in the l10n_client module's directory, which Agaric (against standard and best practices) keeps in modules/contributed. The patch was also not made relative to the Drupal root directory, although it could have been as locale is a core module.

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Courtesy : http://agaricdesign.com