I Don’t See All the Language Strings for PublishPress Plugins
Most of the language strings for PublishPress plugins are in the main language file.
If you have installed a PublishPress plugin to your site, you will find this folder in /wp-content/plugins/plugin-name/languages/publishpress.pot
However, some strings are in different locations. For example, PublishPress uses some strings from the WordPress core. If you want PublishPress to be in Spanish, make sure you have Spanish installed for the WordPress core.
If you can't find a particular language string, contact us and we'll be happy to help.