Hi,
Since those are dynamically changeable and re-curring texts, no .po or .mo files can be generated for them. They can be translated either by WPML string translations or by Polylang: https://wpdreams.gitbooks.io/ajax-search-pro-documentation/content/translating_components.html
If you only use a single language, then you can change all of these text to the language needed.
In case of multiple languages, another possible solution is to have separate search instances for each language.