"Search" Caption in native language

As for my needs I don’t need the plugin to be translated.
But I think it would be best to at least use the wordpress build in translation for the caption “Search”. That way we can be sure that the website visitors don’t get too confused.
I would translate the mo/po files myself for this but I don’t want them to be replaced with zero values after the next updated.

https://wordpress.org/plugins/responsive-menu/