If you would like to change some texts from english to english (translating to another language is described here) you can do it using SayWhat? plugin that allows you to alter strings on your site without editing WordPress core:
After installing SayWhat? plugin go to Tools → Text Changes and click “Add New“. In “Original string” field write original text, then in “Text domain” field add listeo_core or listeo and in “Replacement string” field add new text.
In this example we changed text in claim listing button from “Own this business? Claim it now” to “Not Verified. Claim this listing now!”.
Click “Add” and voila:
How to find text_domain?
Install Text Domain Inspector: https://wordpress.org/plugins/text-domain-inspector/
Click “Inspect Text Domains” at the toolbar and you will see red dots. Hover over a dot and you will see text domain relevant to the text you want to change.