Hello,
For pesky translations, I can recommend this plugin
The only thing you need to be aware of, is that you need to give the plugin the exact, case-sensitive text (so, get this by inspecting the button and copy the hard-coded value, since text-appearance can be modified by CSS sometimes).
Additionally, you can easily find the the “text-domain” (which you also need to specify) of WordPress themes and plugins, by looking at the CSS file of the theme or the plugin in question (Do this through the editor in WordPress).
I translated the text in the button this way. Hope that helps!
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This reply was modified 6 years ago by schouv.