Hello,
The point is, if you change in your language file the price translation, that will impact all your website where the translation price is used.
May I suggest you, to use Css command for modify only translation price in the required area ?
This kind of command, will do the trick :
// To remove unwanted text part :
.html_checkout_page_class .html_text_tag_class {
    display: none;
}
// To add text :
.html_checkout_page_class .html_tag_class:after {
    content: 'Your Translation';
    display: block; // If you want have your new element below
} : See this 
	tutorial
 to learn how to customize your frontend css file.
Hope this will help you.
Regards