A word from BBpress .mo file is not being translated

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Job Description

I have used the localization plugin on wordpress to translate some words -which have translated it in the .mo file.

This has worked for all words apart from the word 'month' on forum pages such as the following:
http://www.buscarlibros.com/foro/libros-academicos/

The following occurs in the localization plugin, but I don't know if this is what is causing the problem:
Loading Issue: Author is using load_textdomain instead of load_plugin_textdomain function. This may break behavior of WordPress, because some filters and actions won't be executed anymore. Please contact the Author about that.

I need this issue to be resolved (I need month to show up as the Spanish equivalent, which is 'mes')

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