Hi Bedurion,
You can indeed use WPML, as well as Poedit. However, we do not know if this is the best way to do it.
Please note that this topic is related with the customization of a third party plugin, not with the use of your theme. As theme authors, the installation, setting or debugging of third party plugins isn’t part of the support we will provide.
To go further, we invite you to ask for more help from the plugin authors and post your request on their support forums: bbPress support.
We remain available for all support requests related with the use of your theme.
Regards,