Changing "browse" button in sourse code

Hi, I would like to change “browse” button text as my website is on another language. I found thesese lines in the sourse code:

<div class=”input-group col-sm-12″> <span class=”input-group-btn”> <span class=”btn btn-primary btn-file”>Browse<span class=”fa fa-folder-open”> </span> <input type=”file” name=”field_7112″> </span> </span>

How can I change the “Browse” word there on something else? It is impossible to change the sourse code through plugin admin panel, and I can’t find location of this file on FTP.
Any help would be appreciated.

Regards,
Aliona

https://wordpress.org/plugins/guiform/