There are no .po and .mo files, because all the front-end texts are adjustable on the back-end – and dynamically changeable texts are impossible to translate via .po and .mo files, it's not supported by WordPress. Once a text is changed on the back-end, a new language file must be generated every time, which defeats the purpose of it's usage.
To translate those texts, you will need either WPML string translations or Polylang: https://wpdreams.gitbooks.io/ajax-search-pro-documentation/content/translating_components.html
All other static texts (the admin area options) are in preparation for translation, .mo and .op files for those will be available within the next update.Best,
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