Change Button Name

I have taken over a WordPress site which has a Contact form 7 plugin. I want to change name of a Multiflinefile Button. In Wordbpress Contact form I only see following code:
<label> Ladda upp bilder/videofil (max 95 MB)
[multilinefile multilinefile-146]</label>
</div>
But in live website I see like this:
<input type=”button” class=”button button-primary qbutton” href=”javascript:void(0);” id=”id****” value=”Upload”>

Is there any way to change button name from backend? Where is CF7 Button value saved?