Changing text in donation-widget?

I want to change texts in the sidebar donation-widget. I want to edit all texts like “raised” – “choose an amount” – “make this donation”

and also the text in the dropdown-menu “once” – “daily” – “weekly” – “monthly” – “yearly”

as I have to translate them in another language. Here you can see the widget in the sidebar

Do is there an easy way to make it?

A step-by-step explanation would be really appreciated, don’t have big programming skills